I really don't see the problem here.
RPGs are in a better state than ever, more good stuff being made than ever before - and even more bad stuff, sure, but you aren't forced at gunpoint to play that, right?
All that has changed is marketing - and honestly, marketing that is targeted at actual gamers that are interested in the genre is so much better than what happened in the decade(s) prior.
Games can do extremely well no matter if they also do well on Twitch.
Games can do extremely well on Twitch but their actual success is very limited.
You don't need Twitch success for a successful game, nor do Twitch viewers directly translate into a successful game.
None of that has changed the way games are made in an important manner.
If anything, it has improved some games that are already well suited to the Twitch format to be even better integrated in that format.
The audience for more cerebral games will never be big - yet those games keep getting made and keep being successful (well, some of em).
Just take something like Dwarf Fortress, there's no doubt this game is "rather cerebral" and has no mainstream appeal whatsoever.
It had its thousands of viewers on Twitch on release - and now it's dead there.
And it's still wildly successful outside of Twitch.
Nobody makes games "for" streaming (notable exception: Actual streaming-based games).
Or will change what they implement based on "this will/won't do well on Twitch".
At best, you'll get some games with Twitch integration, which really isn't that hard to implement (Twitch API is fairly straighforward).
The problem you are having
Tyranicon is that you are competing in a completely crowded field with a game that looks like like an RPGMaker game (in itself a crowded genre).
I'm not blaming you here, I like that stuff. But I'm weird
Anyway, that has nothing to do with streaming existing. You'd have the exact same issues if there was only non-live YouTube.