I don't see it "running into the ground" - people will be using it for many years in the future. However, the supply of people picking it for new projects probably just dried up quite a bit. People will 'grow up' knowing how to work with Linux, because that's what they tried at home, at school, what they learned on the job, and what their friends know. Those network effects mean that it'll mostly be sensible to keep switching to Linux over time, gradually, unless Solaris suddenly sprouts something that makes it a must-have, which I don't see.