I'll agree with many others and say that the school based sub-classes with be gone, but spell schools themselves will remain (if for no other reason than 8 sub-classes would be too many for an initial PHB release). I think the they might keep classic wizard archetypes under another name though: war wizard (evokerish), summoner (with pre-defined statblocks a al Tasha's), sage (part diviner, part scribe), etc. Concepts like an enchanter are strong, but more and more Ick in the connotations what they do and how it works out in play; while classic archetypes like necromancer have always had the problem of cluttering up play with minions (which the summoner would already do, but hopefully would alleviated somewhat by pre-defined stat blocks), or just don't have enough spells of that niche to make a complete character.