I seem to recall a lot of discussion about a new Apple-branded display just before Apple announced that LG would be producing the next generation of display for them. So, I wouldn't be surprised to see a consumer display, containing stripped-down versions of the technology from the Pro Display, geared for Apple users but manufactured and sold by a third-party, possibly LG, possibly someone else. But maybe Apple will crunch the numbers and find that it's worth their while to sell their own displays to the many Mac Mini, Mac Pro, and MacBook users.
In regards to the bolded part - I don't think so. Mark Gurman himself has reported that Apple is working on releasing a cheaper version of the Pro Display XDR and I'm sure we are going to see it. I think, like with the iMac Pro, the partnership with LG, was a stop-gap until they can release their own 1st party consumer-orientated next-gen "Cinema Display" or whatever marketing name they decide to go with.
I really do think that Apple won't ally 3rd party sellers to sell their displays long-term. Why share the profit margin when you can have it completely to yourself?