have to say, as a Flying user mainly, I don’t want Talonflame banned from a personal point of view, and I’m glad I’m starting to see some actual good arguments for why it shouldn’t be banned. However, I’m still not entirely convinced that it should be allowed to stay.
Quite a while ago, Treecko showed us a way grass could (kinda) counter Talonflame, assuming it’s spamming Brave Bird. This still leaves Fighting and Bug. Bug can run multiple rock-types, but this drastically limits its viability, and Talonflame still often leads to a Bug player who might otherwise have won despite the type advantage still losing due to having to be extremely careful about Talonflame.
As for the hitmontop + Occa Cobalion core, I'd like to see this core in use against, say, Focus Blast Alakazam, or even a decent Special Attacker that doesn't hit super effectively, like Nidoking. Sure, they may have a little use outside of countering Talonflame, but if two of your pokemon are there mostly for one possible opposing poke and they're not particularly viable outside of that, I don't see it working too well TBH...
Rorscharch, you quite rightly say that Fire particularly likes Talonflame, and is generally a Hyper-offense team. This is true, although I think saying “it can’t run without Talonflame” is going a little far: It helps, but it isn’t absolutely necessary. Scarf Infernape and Espeed Entei, as mentioned, can help with the speed problem, and this is enough to run a usable hyper-offense team. I agree that a Talonflame ban may hit fire hard, but then it'll be getting Volcanion at some point in the future, which will allow it to function far better in a more ballanced playstyle, so it will be hit hard but perhaps only for a short time. On the other hand, I can see all three of the other types doing well without Talonflame around, as a well used team of any of the types can do well if used correctly, so long as there isn't a pokemon that is almost uncounterable and can happily come in, KO something, and switch out without losing giving the opponent a chance to KO back.