The answer is simple: don't bet on proprietary software as a platform. If you do, you've locked your own company to the vision of another. With proprietary platforms, you have zero control over your future.

Even if you don't like the vendor's vision, you are forced to go along because you invested too much in the vendor's vision to pull out.  This reason you people are so frustrated is because of a phenomenon called vendor lock in.

You might have invested in proprietary technologies because they looked to be more productive or less expensive than open source, but you did not consider the hidden costs. The solution to vendor lock in is to move to open platforms like Linux.