How much different is he playing than a rich man's Ibaka, though? He's often not even playing center on defense nowadays. The Spurs are cross-guarding with Sochan against elite centers and letting Jeremy get cooked while Victor roams the weakside. I don't see why doing that more permanently but with a player who can actually guard the position playing there instead. So far we're talking about undersized folks and Collins (who basically inspires every opponent to go at him as hard as they can) as options.
I don't know that Wemby's a very good vertical spacer, let alone the best ever. He has some big natural advantages there, but his inexperience is glaring. It's getting written on as his teammates' fault, but if one actually looks at the great vertical spacers in league history, there's a lot they do that Victor is maybe just starting to incorporate. He should be the best shot-blocker very soon if he hasn't gotten there, but not every elite shot-blocker played center. He's a very good rebounder, but it's not like him rebounding less as a PF is a bad thing. It's only bad when the center isn't rebounding to make up for it.
Wemby's future deserves an actual consideration though, and not just a flippant glance. Is he a big, or is he just big? There's a continuum between wings tall enough to play the five and true centers, and not everyone on the list would count as part of a "two-big lineup". That's why Wemby's development has a large effect here. If he's going to continue to trend toward a floor game and perimeter shooting, he's going to be more of a oversized wing like Durant or Giannis rather than a stretch-five like Porzingas. It seems pretty clear Wemby at least wants a chance to explore becoming the former before settling into the later, and part of the environment the Spurs are creating is to allow him to have that chance. That means they shouldn't write off playing centers next to him during this transition time to see if it can work. But if they play stretch-fives, it basically defeats the purpose of the versatility. If he's there at 33, I would be a big fan of drafting Edey to see what happens. It doesn't have to work, but that would be far preferable than committing to another year of Collins, Bassey and Barlow as the only options.
Reid's a good player, but he's not the only archetype that should be tried.