There are existing businesses who bet on Solaris and have it widely deployed. Moving to Linux may not be trivial. That is, it may not be beyond the FYO point. [1]

The IBM AS400 isn't something that people really desire, but there are a lot of businesses that rely on it and IBM still gets paid to support mainframes.

[1] http://dtrace.org/blogs/bmc/2004/08/28/the-economics-of-soft...

You are overgeneralizing. Sun's (and Oracle's) main customer base are "people" who use Solaris/Oracle to manage their millions of customers and billions of dollars. They don't want to mess with it, they want support, and will pay for it. The question is, "how much?" -- and Oracle is very good at getting a profitable answer to that question.

And don't forget that no-longer-OpenSolaris is still freely available ... and might even become something now that it's free of the dead hand of Sun (at least for it being a truly "open" project).

I for one am not happy with Linux and would love to run Open/whateverSolaris ... if it has serious driver support. That's been the Achilles heal of x86 Solaris for more than a decade (e.g. something I directly experienced in 1999) and fixing that will likely be a determining factor in its future success.

Unfortunately that's very painful hard work and lots of it, I wouldn't predict success on general principles. But one can hope.