I think this work is brilliant. In one of our recent developer meetings, we had explored the idea of replacing a few parts of our code with PHP Extensions written in C for optimization.... This may negate the need for that completely! I am very excited for what this might mean for us!
And since our recent shift in coding styles, we are relying in many cases on factory classes to ease the burden of dependency injection. We may be able to implement this in some cases by simply adding the compile call to the factory and be finished!