The problem here is that QC is not lagging behind in the field of computer science (all the theories are there) nor the field of hardware engineering (the engin

The problem here is that QC is not lagging behind in the field of computer science (all the theories are there) nor the field of hardware engineering (the engineers can build every we tell them to), but in (condensed matter) physics. And physics is something you can only speed up so much, especially given that there are many other equally exciting, high-profile projects (think LHC).