Given the accelerated R&D that happened since the 70-ties in computer science, the huge resources that this industry can throw at problems and the fact that quantum computing can theoretically solve many important problems for us, 30 years is a long time.
I'm not saying that it won't happen eventually. I'm only saying that Moore's law is a more imminent threat to current encryption methods and that quantum computing still doesn't solve NP and as long as NP is not P, unbreakable encryption is a reality that quantum computing won't change.
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).
I'm not saying that it won't happen eventually. I'm only saying that Moore's law is a more imminent threat to current encryption methods and that quantum computing still doesn't solve NP and as long as NP is not P, unbreakable encryption is a reality that quantum computing won't change.