CPU bottleneck since 2004?

So there seems to be a 6Ghz upper limit on processor speed that we can't break through since clear back in 2004. How did I miss that? As a result we've moved to doubling down so to speak with dual or quad core processor machines but only a handful of applications actually take advantage of that by offloading processes to multiple processors.

This seems like it prefaces a day of the designer, in which software engineers will have to be even more lean and mean than usual. As a side note, STATA (my favorite stats package ever). Offers licenses that take advantage of this but they want to charge for it. Who wouldn't right? It also prefaces a day of computing really starting to suck. We're supposed to double capacity every 18 months. I'm looking at buying a new macbook pro with a dual core processor that's pretty similar to what I have now and is almost 3 years old. Am I missing some nuance here?