I personally like the privacy it adds. But I think I’d clean up the rest of the landscaping. It seems a bit messy to me.
I’d want something more symmetrical and neat to make up for the big trees…

While rhodies are not my favorite shrub - too much of the year as a big green blob - they are ubiquitous here and I lived for many years in a garden that had massive ones the size of a school bus. And although they can be transplanted relatively easily, size matters, and those will be very difficult to move and re-establish elsewhere without professional help.

One suggestion would be to thin them out and limb them up so there is more of a structural, tree-like form that will allow light to penetrate through more easily.

What will be your view with them gone?

PS: IME grapevines don't want to stay small.... and take a deal of care to have them produce, and not be eaten by the local wildlife...

You can prune them pretty significantly. You can remove one (finding someone who wants it might be good) and see how things change. I'm a fan of taking it slow, because you can always do more later if you start relatively small.

Personally, I'd love them and keep them and if you were removing them, want them for my yard.

They could be trimmed up into small trees and under planted if you wanted. Seems a shame to rip them out if you aren’t sure.

You are not planting food producing anything, including grapes, in the shade of those larger trees. It isn’t the rhodies that are making things dark. Rhodies are understory shrubs, and enjoy the shade of those trees. Food crops need blazing full sun.

Step one should be to find an aesthetic pruner (a good one) and try to shape the form to open up the space. If that still fails to give you the view you want, then I might spend a year trying to find an organization that would pay to have them moved. Those are too nice to just kill off.