[MattGaiser]

No, as the need to learn new things is going to be inevitable. Even if you have been a Java dev forever (and that language will last your career), I know a couple Java programmers who took months and months to find work in this market as they didn't keep up with the latest in Java.

Keeping up with the latest tech is more properly compared to diversification. You are not abandoning your old skills, but you are adding some new ones that have a good chance of being valuable in the future. You may end up learning something worthless, but as long as what you learn is mainstream, there are probably jobs for it.