I'd be pretty miffed if they did this. You need only look at the comments contrib to see an example of something that was OK'ish when it was incorporated, but has languished since then. Now I question the need to even have it in contrib.

We don't have to bake components in for them to be excellent. rest-framework in particular moves ridiculously fast, and being separate from Django lets them do that. Also, if in the future something even better comes out, I can easily switch to it.