> Well quantum computing is obviously physically possible.

Well, since you mentioned this: would you mind linking me to a single demonstration of it that has been conclusively established as evidence of quantum computing? I've seen lots of D-Wave stuff but to my knowledge the experts don't actually really buy those.

> However the difficulty of scaling quantum computers goes up exponentially with the number of qubits, so we might not achieve enough success to make them practical.

But yes, this is more in line with what I was thinking. Even if it's possible I don't expect it will be practical (hence why I used this word in the earlier comment).