In response to the original question, it all depends on what you want out of a degree. I know plenty of excellent practical musicians who would rather die than have to do the sort of academia associated with, say, the Cambridge degree. However, I have a friend at Cambridge and apparently the person next door to her practises non-stop, but I somehow I doubt this has a good effect on his grades and I don't see why if you're that dedicated to your instrument, you wouldn't just go to music college. At uni generally speaking I don't think there would be enough time for really hardcore practice; I know people in the RSAMD who practise for 3-6 hours a day and I don't think that would be possible alongside a uni degree course. There are some places that offer some balance, like Manchester, Glasgow and KCL. Uni degrees offer more stability on the jobs front, but in the case of the majority of unis are not advisable unless you have an interest in musicology,compositon etc.