Sorry Gator, mate it's your not your daughter who needs to change.
What happens if you 'fuck off her lover' what will that achieve.
She isn't suddenly going to decide she likes Cumberlands. She'll find someone else she's attracted to and I doubt her new choice will will feel comfortable swinging to the left either.
If grandkids are your concern, the fact she prefers breasts to a penis, does not get in the way of that dude. Plenty of non hetero couples have children, adopt, whatever.
Stop stressing it, but also stop expecting it, would you 'put up with it' if she was hetero and just decided a career would be more important than kids, or would you want to 'fuck off' her male partner as well?
I take your point in response to Prep, I've got two girls of my own, but it shouldn't figure mate.