I believe 8,000+ yard courses are in our near future, if there is any concrete evidence supporting otherwise I'd be thrilled to learn?
8000+ yard courses are here:
https://www.golf.com/courses-and-travel/2018/04/24/let-big-dog-eat-myrtle-beach-course-extended-8100-yards
The fact that one out of roughly 80+ courses in Myrtle Beach (used to be 100 courses, I think) went that direction is smart to me. They positioned themselves in this niche market for young low handicap players. When it gets to 10 courses, then you have a movement, imo. I believe the cost/economics of doing this (maintenance, additional land, taxes...) will keep this to a small number of courses. Why would I pay $$$ to play a Doak 5 course from the 8000 yard back tees that I don't need?
My son is insanely long now and also insanely wild. He can't really play 8000 yard golf courses yet, but he will get better when he moves to Florida next summer. Thus, I do see the need for 8000+ courses, I just question how many.
I just got fitted for new clubs, so I am trying to extend my game. 
That's just a marketing gimmick for them -- that course has long had billboards up in Myrtle Beach claiming they had the toughest closing stretch on the Grand Strand. Now they'll get to replace that with billboards about how they're over 8000 yards. It's not an especially good course and there are at least 30 courses in the area I'd play before even thinking about going there. I know the PGA Tour isn't overly concerned with quality architecture, but the quote from the course owner claiming that it will now be a potential tournament venue is hilarious.
Edward,
You are correct, 100%; this is a marketing-only move.
About 30 years ago, when I first started playing golf at MB, one of the first rounds I played was at Eagles Nest because it was one of the very few places, even then, that would allow walking. It's an ok golf course, and I may (or may not?) have gone back a time or two more, but I have driving by it a hundred times since on my way to another course without even considering playing there.
My assumption about this is that there was otherwise "useless" land available to put in some tee boxes at minimal cost; I can't imagine that a large amount of money was invested by the owners to do this as opposed to other improvements. MB golf is based on packages, and Eagles Nest, like everybody else in that market, is looking for a way to get included in desirable packages with other courses.
Bottom line is that assuming that THIS course going to 8000 says anything at all about the state of the game in 2019 isn't justified. What they've done is no different that using the word "links" in a course description, or having a bagpiper, or a sleeve of balls and a free beer with a paid greens fee, or a faux castle clubhouse, or any other marketing tactic in an insanely competitive market.