Took an offer that will involve some less common languages. Will this matter for long-term career prospects? In short, I got a fantastic offer at a place with an ideal location near my girlfriend with a really cool culture, in a city with a low cost of living.

The *only* conceivable negative is that their codebase is mostly in Tcl. Now I don't care personally, I think Tcl is a pretty pleasant language to use overall and is definitely under-appreciated. But that doesn't change the fact that I'll probably never use it at subsequent places of employment.

Does it really matter if I'm writing Ruby on Rails web apps right out of college? Will this hold me back in the long run? Or would it be enough for me to just maintain familiarity with other cool tech stuff in my spare time (which I do anyway)?