I voted yes.
It's not uncommon that some classes have 2 specs they are exspected to use in raid, and it might not be something they really can use outside.
Just take a healing priest. Some encounters holy is better then disc and opposite, so they switch between the 2 of them. Then they have to actually remove their spec when they went to do real damage outside of the raid. I know disc can do some okay damage, but still :P
Yeah. People can go a bit more for cookie-cutter, but overall the the specs are more individual now. If it matters to them they change spec after every raid, which i've known people to do. It's possible, but annoying to do all the time. That shouldn't be nessesary. Some people can live with one spec, and that's fine for them, but for those that have 1-2 specs that they are required to use, and have a last they think is more fun, it's a nuisance.
Dualspec was a really great thing to me. Trispec is less important for me, but i do miss it a bit sometimes.