Showing how you as an individual might contribute to a thriving college community will presumably not become less valuable.
And personally, I suspect that to the extent things like your ethnicity, religion, or so on are relevant to your individual story, that will remain viable material for a good essay in appropriate cases.
I note the US Supreme Court made it very clear that sort of individualized consideration is not illegal. What they think is illegal is treating people differently based just on the categorization.
So while universities may be cautious about putting formalized wrappers on relevant policies (such as named initiatives, offices, and so on), that doesn’t necessarily mean they will stop doing what the Supreme Court said they could do, namely consider your individual story.
And if that is right, if anything it will make good essays on this sort of topic, again where appropriate, all the more useful.