That would be a great way to get me to both stop paying for their service AND start blocking ads. I'd just send $10/month to my preferred creators' Patreons instead, or something. I already put up with their frankly terrible music service because it comes bundled with ad-free YouTube; I'd probably be better off.

I realize I could do this now and it's probably better for the creators overall, but knowing that everyone I watch gets a little something, whether I subscribe to them or not, is nice.

It's almost certain. They will follow the Netflix model. Plan right now is $12/month. It will soon be $15, then $20. Because they care about their price-conscious customers, they will then offer a $12/month subsidized plan with ads. How nice of them to offer us the choice.