I guess there will always be routes where you do want the ULH aircraft and that's probably why a 747 fleet of 12 or 16 has its niche. The 744 like the 752 isn't getting any younger as time goes on though so eventually they are going to exit stage left.

So if we are still taking bets:

• 330s come now, do what they're doing but also encroach on 772 flying.
• 330Neos for the long term 763/764 flying.
• park the 4 744s, but not replace them, you now can use the 772 on some of those routes.
• buy a half dozen 773s, maybe a few more, to replace 744s at the end of the decade but it won't be a 1:1 replacement. So now you have just what you need for very large ULH flying and can have a such a small fleet because it's already a part of a larger fleet. Win win.