Zardnaar
Legend
If the argument is that WoTC need some kind of 'kick up the paints', I could buy that. IMO they've been coasting for a long time. I think it's shameful just how weak some of their products are. eg Fizban's Treasury of Dragons was a huge disappointment for me - and more importantly for my son, a massive fan of dragons. We have a 3PP dragon book from DM's Guild that is a hundred times better and clearly had far more work go into it. So much WoTC product is just lazy. I guess because they can. If Kobold Press published stuff as weak as WoTC's typical output, they'd go bust.
Edit: Of course the 5e PHB MM & DMG* (and XGTE) are still good, and continue to sell well as evergreen products supported by a solid 3PP ecosystem. ONE D&D does pose some threat to that though; it's not impossible they could muck up the ONE D&D PHB/MM/DMG trinity.
*The 5e DMG is a bit arguable I guess, I'd say it has a lot of good material that is easy to overlook due to the weird presentation order, with very advanced stuff right at the beginning, and the meat & potatoes buried inside. Anyway it's the 5e PHB that drove the success of the edition.
Things started to fall apart around Tasha's imho.