My rig is full AMD (5800x/5700xt), but that's purely because they happened to be the better value at the time. The second they get a lead in the consumer GPU market (which they likely will since nvidia simply doesn't care about it vs the ML market now) prices are going to rise again.
And don't pretend that these prices are anything resembling affordable. That would be when you could get a legitimately mid-range card for ~$150 (rx580).