The biggest problem is that even if quantum chips are faster than regular ones, it doesn't really matter. Chips have reached the limit of how fast they can go because they are dependent on RAM. CPUs have gotten so fast that they now have to slow down and wait for the RAM.

Wanna make a billion dollars? Invent a superfast RAM chip.

I just got back from visiting my friend at Cornell, she and her PhD adviser are currently doing research on M-RAM. It's fast but they can't keep it stable outside of super cold temperatures.