Large handed composers will start composing works with intervals you need large hands AND a small piano to reach. It's probably already happening on mini digital keyboards.
The classical guitar has been available in multiple sizes for many years now. I don’t think the situation you’re describing has become a widespread problem there.
But at least competitively, this is probably self leveling. Large handed composers they play big chords on a small piano, but they'll probably struggle to play "regular" music on this undersized piano.
There's only a problem if everyone has to use the same piano. If everyone can choose their own size piano then hand size isn't a factor