Say goodbye to 2-strokes?
And 4-strokes?
I'm afraid so once there's no advantage to them. Right now the only big advantage they have is price, but that's not going to last long. If you think about it, electric bikes are just an electric motor, battery, and electronics. Once the demand is high enough it should be a lot cheaper to make an electric bike, than a ice engine with it's 500 different parts.
Ice vehicles will become out of date collector items, and classic curiosity's, the way hot rods, with old geezers driving around in them are now (No offense to Tom).
You won't care though, because the electrics will have far superior performance, that's infinitely tunable at the touch of a computer command. Weight and mass will eventually become much less than ice engines would ever allow. Our bikes will be so light, and fast we'll have to add weight to them just to keep them on the ground.