Wizards has released a preview video of their virtual tabletop, complete with the requisite BIPOCs making soy faces at groundbreaking things like having 3D dice that roll when you drag and drop them. It's nice-looking, I'll grant it that, though I anticipate a significant price tag.
Think on this: Someone has to design thousands of 3D monsters, characters, and maps. Do you want your game to have a certain-looking cathedral map for your game? Well good fucking luck finding one done up in this VTT, and if you can find one that's a close match, bet you it costs $$ to get, or a significant monthly subscription cost. For current VTTs it's an easy prospect to use a 2D map maker to just draw up a map, several of them will automatically export with walls and light sources pre-rendered for Foundry. Same deal for characters, I foresee that lots of people are going to be salty that their super-specific queer tiefling rogue is not available as a mini because it lacks their distinctive septum piercing and matching cockring.