Josh. As always, eloquently stated. When the time arrives for me I'll also purchase a 4K replacement. I just wonder when that time will be.I get it, though - you ended up with a 4K TV, loved the look of it, and wanted to emulate that with your projection setup. It wasn’t a blind buy but an informed decision. And you were probably right to wait until you saw 4K at home to make that decision.
I found myself in a similar situation recently where I had to get a 4K TV. I ended up having the opposite reaction - I thought it was perfectly nice but it hasn’t triggered the upgrade itch for my projector yet. But whenever my (HD) projector reaches the end of its life, hopefully not for a long, long time, 4K will be next for me.