Two weekends ago, I came "this close" to getting rid of both my DSLRs and lenses and making the jump to mirrorless. I had done a few weeks of research and read several reviews. I know and understand the differences and\or benefits and I knew it would be me jumping into a world I thought would be at least a few years away. I'm old school, from the camp of "it's the photographer, not the camera", so the upgrade was just me jumping early into the future of photography.
I got all my stuff ready, made an appointment and took it to a local camera store noted for being fair, and let them go through every piece extensively. They did and about 30 minutes later they gave both bodies and both lenses a grade of 'excellent'. The price they offered was shockingly less than I can get selling it all privately. I pondered their offer for a few minutes and passed on it. The difference between mirrorless and my current cameras isn't enough for me to spend $2000, get very little for what I have, and start all over with new lenses, filters, hoods, etc. I'd probably go with the adapter and keep my lenses.
I'll never be too good for my equipment, so going mirrorless is just (for me) an unnecessary change. Also, I don't long for WiFi connectivity, or video. I have zero interest in video and since I'm not a professional out in the field, I don't need to get shots back to an office or publisher asap. I can wait until I'm back home to download.
As I got in my car and drove away, I was relieved that I didn't say goodbye to my current stable just for the sake of upgrading. I'll use them until they can't go anymore and by then the industry will have done away with SLR. I'll make the switch then. Or I'll get a new D850 that someone never used and that'll carry me the rest of the way.