Ten years is a very short time for a programming language. Python is decades old and hasn't hit its peak popularity yet. I don't know of a single mainstream language that has died, except for perhaps ColdFusion or ActionScript.
Depends on how you define death. There's ALGOL, SNOGOL, LOGO, Pascal, Visicalc, APL... They were all mainstream at a point, and they all still exist, but the userbase has become tiny.
