Re: How about a solo Avengers franchise?
It could be cool, and I'd definitely love to see the extra movies beyond the tentpoles. But I do wonder if you can make, say, a Scarlet Witch movie on such a low budget, without it looking... low budget. You'd need to get creative teams that are passionate enough to put out quality stuff that's on par with the big-budget films, tone-wise, quality-wise, etc. Could be a lot to ask for.
I do know at this point that Marvel Studios is still small and can only afford to spend the whole of its resources on tentpoles. Something would have to happen on a structural level in their organization in order to support the additional lower budget films.