Most mathematicians still wouldn't care about foundations if you came up with better foundations. It's a separate area of research from most other fields of mathematics, it's not relevant to what most of them are researching, and they just don't have any interest in it. And unlike category theory more broadly, they don't particularly benefit by studying foundations deeply. It doesn't provide any improvement to their own area of study.

Everything I've just said is completely uncontroversial among mathematicians, for what it's worth. The comment I just wrote has probably been expressed on r/math dozens of times at this point.