Alright, I've put the unwieldy task of making any solid predictions aside and will take up a different part of this, it seems increasingly unlikely "what if": what it says about the process.
If WotC ignore the survey feedback that would be bad... but it wouldn't be the worst thing. Fundamentally I think the problem with WotC products is too many cooks in the kitchen. They are just too big, under too much scrutiny, and would rather hedge their bets than take risks. So they have large design teams, who are then also taking on board notes from a legal department, a marketing department, (sometimes) cultural sensitivity readers, and probably several other sources I'm not thinking of. They also have tight deadlines from wanting a full and carefully spaced release calendar, and for OneD&D, from wanting to maximize the publicity potential of a meaningless anniversary. This results in unwieldy adventures with unfinished plot threads and vestigial elements no longer serving whatever purpose they originally were intended for, and rules material where after a long period of playtesting one draft, some quickfix, untested rewrite gets enshrined in the rules last minute.
So in this milieu, is inviting feedback from thousands of additional people actually a good thing? Yes, in as much as it vetoes the ideas fans hate the very most. But I don't consider survey feedback as a whole to be a wholly positive influence. The best games are not designed by committee. If they are not paying as much attention to feedback as they pretend to, on the whole that enables a stronger, more cohearant vision for OneD&D (something I have accused it of lacking in the past).