A new version of HTTP is a perfect (and, in fact, the only) opportunity to introduce SRV record usage into the HTTP protocol. The fact that they have chosen not to do this, even though SRV is essentially made for this – an extension of the MX record system into a generalized system for any and all protocols – requires an explanation.
I fail to see how HTTP n.n has anything to do with the web centralizing towards Facebook, nor have your posts provided any clarity on that.