For the "more programmers" question, Scirra has been looking for one more dev to hire in UK for more than 6 months now, and last I heard they still hadn't found someone that would fit the job/requisites.
About Scirra Careers link at the bottom of your screen
For the "change the license fee", the question already rose several times in the past and every time Scirra responded by telling they had no plan on changing their policy on that point.
And I still think it's a smart move putting them far above their competition on that specific aspect, C2 is so cheap it's almost a steal.
For the "serious users", C2 is almost 3 years old, we should start to see some of those "serious projects" pop up during 2014.
For the store/assets/plugins, it's in their bags as well and has been discussed in the past too.
One improvement will come from the new arcade that should support third-part plugins/behaviors and should have some "linkage" with the store as well.