Joe, just speaking for me, when I don't enjoying playing an instrument I just stop playing it. Since my instrument of choice is a guitar, I MIGHT pick up another guitar and see how it goes: acoustic vs electric, single coils vs humbuckers, long scale vs short scale, etc. Or I might pick up a keyboard or a bass, or something else if I have one lying around. Or just listen to music. Or just do nothing related to music at all, like read a book.
I find that if I go on vacation for a week without a guitar, when I come back everything seems fresh and new again.
But I don't think your friend is alone. Wish him luck from me!
