I thought that the neighbors might have been a bit more tolerant if Jack Twist had taken over his dad's ranch. That's John Twist's son and his friend (euphemism in many parts of the country) who own that place. Whether small scale ranches were feasible or whether their going the way of the passenger pigeon is quite possible. Economics of scale, you know.
Can they have had a sweet life together, given the social environment of 1967 WY is of course an answer I can't give. I wasn't around in 67 but I can imagine it being a very repressive environment. Sure, adults in the local community might have reconized that as long as ENnis and Jack keep it private, some tolerance is granted but it only takes some homophobic teenagers or ppl of that ilk to burn your place down and shoot down your cattle. Then where are you left.
First we get to point A, is a cattle operation run by a same sex couple possible in 1967 WY, then wonder if there was enough chemistry for Ennis and Jack to stay together as a couple for decades. I would say yes. At least they deserved the opportunity, which was denied.