Yes, the biggest problem that "write once , run anywhere" has always had is that platform vendors don't want it. It's only an advantage to underdog platforms, t

Yes, the biggest problem that "write once , run anywhere" has always had is that platform vendors don't want it. It's only an advantage to underdog platforms, this is why Sun wanted it so badly but MS did everything they could to stop it in it's tracks. It's a lot more difficult to justify the purchase of a $2000 Mac if 100% of the software can be run on a generic Linux box for half the price. At least with FF and Chrome being open source and gratis rather than directly commercial some of this motivation is alleviated. It's also more difficult to put up a barrier to entry for a new incompatible feature if your competitor can look at your code base and re-implement it from there.