It appears that 40nm is the limit on process size, any lower and quantum effects become a problem e.g. tunneling. The trouble is that granularity is a problem with coding for multiple cores. Some problems do not parallelize(sic) well.
We'll start using the space offered in parallel dimensions. You know, like mice. "Hitchhiker's Guide to the Galaxy Fans" know that mice are the most advanced beings in the universe, but only a small portion of their being protrudes into this universe . I think that's how it worked.