Don't read to much into his rant. Here's the thing: anything that can be tried, will be tried by someone. Gavin and his peers have taken much into consideration about what and when features are added to Bitcoin. Meanwhile a lot of devs have left Bitcoin because it is not progressing fast enough for all the new ideas. It is a good thing that MP has announced his intention up front so we know where his faction stands. Maybe he will go bother Buterin now.