The idea of a launcher (similar to league or something) is ideal to be honest.
TB survives on its community yet the game offers no redirection to the forums at all; anything like that has to come from the existing community.

The tutorials are so-so in my opinion: making the introduction to the game nicer is obviously a good step and I support this notion entirely, but I don't think it would have the same impact a decent launcher/client would have.

The youtuber idea is maybe idealistic.

Point 4 is exploitable.

Point 5 is whatever. Feels like it might give people less reason to explore outside the client if you see what I mean.