It's funny you should post this question, because I just did a quick denim inventory the other day and, at the very bottom of the stack, were my straight-leg, dark denim, plain jane jeans. They fit great, make my bum look nice and my legs look long (er, well, longer), and yet...they were at the very bottom of the stack. Unworn. Forgotten. Lol.
Anyway, here's my question: how many pairs of jeans do you have? I don't think you can wear them full length right now and look current (although it will look classic, which can be a good thing too), but I wouldn't cut them if you have lots of other denim options. You could try the gigantic cuff thing to make them look more current. but if you cut them off, you'll essentially destroy a perfect pair of very flattering full-length jeans that may feel current again in a couple of seasons.
Or, perhaps you're OK with looking classic rather than trendy (although I get the feeling you wouldn't have posted this question if that weren't the case).
Anyway, if it helps you at all -- I'm not cutting mine, and you know how scissor-happy I am. I've got like five pairs of raw hem jeans at the moment. I have plenty of other jeans, so I can't see the point in permanently altering these ones. Who knows -- maybe I'll actually want full length straight legs in a year or two.