Not disagreeing necessarily but why do you think this? Codes have got better, qbits have got massively better over the last few decades, why wouldn't the two lines eventually cross?
Do you think there is some physical principle that will prevent getting a quantum speedup, or do you just think that the practical engineering challenges are simply too difficult?
Do you think there is some physical principle that will prevent getting a quantum speedup, or do you just think that the practical engineering challenges are simply too difficult?