If anything, they'll try to continue with Java instead, I'd expect. They're a big user internally.
One thing to note is that I don't entirely understand the IP issues surrounding Java.
He checked out from the Java world a while ago.
When you stretch out the time-frame, your assertion sounds substantially less credible. At least to me.
If the bar for getting away from it is rewriting millions of lines of code and retraining 1/3 - 1/2 of their engineers, it seems credible to me.