A lot of us get comfortable with our core competency language and stagnate in it. Even I am guilty of this- especially when it comes to my favorites of Actionscript on the front-end and PHP on the backend.
The RIA landscape is rapidly changing.You must take the time to step outside of your comfort zone and explore new and emerging technologies. If you don't, you'll not only find yourself under-informed when it comes to the current tech landscape, but your solutions to technical problems may be use obsolete or soon-to-be-dead approaches.
Keep your finger on the pulse of emerging tech, be sure to take the time to dabble around with it. If not you may find that once your term ends at your current company and you need to move on, your once "rockstar" skills are yesterday's news and playing catchup at that point is a tough uphill battle.
TL;DR: Get ahead of the curve today and start investigating the rise of NodeJS, Server Side Java Script, and NoSQL.