A couple of taped conversations in not very clear English, a letter, a very indirect interpretation of SP's will and the statements of Gauri das Pandit and Yasodanandana, is not a strong foundation upon which to build the 'ritvik' lineage, especially when we look at the historical circumstances surrounding the tapes and letters, i.e, that forgery is in the air, holding back of letters, doctoring tapes etc etc. If sincere disciples of SP exist, continuing what SP established, they can accept disciples, in my opinion. The problem is many have, under the power of illusion, taken on the role in a wrong way and with wrong motivation. Who actually follows SP's idea of what Iskcon should be? Where are the harinams? The spiritual franchise Iskcon rather than the corporate centralised GBCism and multi plenitude of management positions? The Varnashram Dharma and cow protection? The individual spontanaiety of early Iskcon where did that go? It should be pretty easy enough to see just who is sincerely following Prabhupada and the original Iskcon spirit, there are enough sources for this. Whatever we think of how correct these sources are is another issue, but it is something that can be determined pretty easily with any group- who is sincerely trying to continue the original mission can be worked out by anybody whether they believe or not. For all I know SP could have established the 'post mortem ritvik vada'

but then it could have all been some frantic grasping of straws by those who 1) wanted to suceed as gurus- thought their intiation into Iskcon management secrets was the only way for Iskcon to survive, 2) who wanted ritiviks to suceed SP so they could start a rival group to Iskcon. Meanwhile while they both spend their precious time arguing back and forth, other issues get avoided and the original preaching missions endeavors becomes stunted. Out of the two there is more spontaneity in Iskcon, and the principle of guru however tainted, still exists, and they can read other books besides those of SP, on the other, in the ritvik, it is SP only and the individual spontaneity is more curbed.
Both however are fanatics- SP has got everything right, moon landing hoax, literalisation of Bhagavatam, etc etc and they cant accept that even an acarya can have these kinds of mistakes, as part of the lila (and i'm not talking about the deluded self appointed types here- but even that is lila, as all is in my opinion- including mine and yours too). For example in Mahabharat there are examples of mistakes being made by direct associates of Krishna.
A kind of Prabhupada modernism and modernism with the whole IGM and Bhaktivinoda Thakura is needed in my opinion. We see the pattern anyway, how initially SP changed things according to time, place and circumstance, so we see that in regards to Iskcon GM principles only chanting on beads daily and following regulative principles seems to be common denominator, not to mention deity worship and missionary endeavor, there is besides this a principle of flexibility. SP changed 64 rounds to 16, allowed men and women side by side in ashrams, and other GM branches have different standards too. Of course flexibility is here set within tradition to, and that tradition does indeed have a tendency towards modernism and adapting to the circumstances anyway, traditionally! Both Ritvik and Iskcon lag behind in this need to adapt, and Ritvik more so than Iskcon.
Anyhow these are just a few of my thoughts on ritvik, which i was involved with and yet was not much of a fanatic, quite mellow in fact, and questioned it all, went along with it to some degree and saw my wrong motivations also and pulled out. But I have to say one thing, between Iskcon and Ritvik, the Ritviks have more study of SP going on in their temples, and more of a direct contact, they take him more seriously, whereas in Iskcon he seems more distant sat there on his vyasasan and limited to Bhagavat drips in morning classes. And in both Ritvik and Iskcon there is not much study of Bhaktivinoda and other previous figures, Goswami writings etc going on too (yet more so in Iskcon). There will exceptions to this too in both branches. Those busy using the terminologies of the anti-cult cult and its psychiatric inventions and impositions and terminologies and using these to 'decondition' themselves from bad experiences of 'brainwashing' in Iskcon, and see Iskcon history only in terms of zonal acarya-ritvik and abuse scandals, Im afraid i must say that I feel this approach misses the point too, for there are other factors in Iskcon history, a history which reads like other groups and movements which are associated somewhat with the Counterculture in their more seedier side.