Do you advocate continuing to call an ex wife a wife? IMHO, if a relationship stops being sexual, but love is still there, it becomes platonic.
What's wrong with platonic? We connect deeply, and continue to be very intimate. Love isn't about plumbing.
When I say I have poly relationships I mean my relationships which are currently sexual, not may or may not be sexual. If you don't like "platonic" for a love, but not sex relationship, then propose another word for it, rather than destroy the sense of poly.
I am new to this, but I don't think it "destroys" the sense of poly. After all, poly isn't just about the sex. (but the sex is wonderful too!)