Now that 650b is obviously the only way to ride, you can expect the marketeers to target 35mm as the only combo to really make the trails feel alive
You’re getting a bit ahead of yourself there, 35mm is the standard that might actually make a noticable difference, but people won’t buy because it looks a bit odd. So they’ll push it for a couple of years then introduce an inbetween standard. 32.9 perhaps, which satisfies people’s desire for change and novelty without being different enough to be scary (or worthwhile)
Course, they won’t call it 32.9, they’ll call it One Point Five Bar or something to hide the fact that it’s not actually in the middle.