If the community picks it up and starts developing it (in addition to developing with it) great. But if all the code is written by Google employees, and they th

If the community picks it up and starts developing it (in addition to developing with it) great. But if all the code is written by Google employees, and they then get reassigned, you'll be left either learning how to write compilers or hoping that someone else, not at google, already has. You wont be completely, and immediately fucked, like we are on GAE. But you'll be adding "rewriting all our code within the next two years" to your to-do list.