50% speed up, or even 2x, 3x matters to a few niches and users. But for the vast majority it's not significant enough to change/accept limitations (not 2.7/3.1)/accept risks (is this as tested/supported as CPython). We'll just wait for CPython's regular speed improvements and/or effective processing power to increase another order of magnitude.

Research like this is very important. I just don't think it's wise to be viewing it as a silver bullet for use in production.