theodp writes "After reading the recent call for Steve Ballmer to step down, gdgt's Ryan Block concludes that it's time for Bill Gates to come back to Microsoft. 'I've long seen it as a foregone conclusion that Ballmer isn't the guy to be running what was until quite recently the world's preeminent technology company,' writes Block. 'The more pressing question is: who should replace him? I think we all know damn well who — but I'm not so sure he's available. Yet.' Block adds: 'I'm not saying Bill's going to leave his new gig as the world's greatest living philanthropist with aplomb, but the multi-billion dollar wheels at The Gates Foundation have been set in motion — and lest we all forget, the Foundation's endowment is tied directly to Microsoft's long-term success. It may just happen that Bill can help the Foundation more by securing Microsoft's future.'"