May I draw your attention to an insightful post by the ever-thoughful Jan Capiński about conservatoire training for singers. There’s a huge amount of food for thought here, and I agree with a large majority of the points Jan makes.
Most important of all is the primacy he gives to the choice of singing teacher. In the long run, the quality of your singing and its development is what will make or break your career.
If you’re currently researching music colleges, my advice would be to give absolute priority to the process of identifying the right singing teacher and letting the rest follow that. I’ll deal with how you work out who the right teacher for you is in a post of my own at some point, but in the meantime, take a close look at what Jan is saying here: