About the only things that haven't changed in my HT setup are my Jamo speakers and the cables I use to run them.
All the other components have changed. The stuff I plug in (computer, consoles, TV) usually have a shelf life and are the main cost factor. Easy to understand.
The amp is a slightly different story. My current amp is the second Denon I've owned. The first amp I bought was a Sony and it died when the capacitors wore out. My second amp was a Denon and it was retired and sold because it wasn't compatible with 4K HDR over HDMI to my 4K TV. The current amp is the cheapest in the Denon line and allows 4K HDR and this futuristic technology called Bluetooth which lets me stream Spotify from my phone. My amps last as long as I am happy with the features they provide.
The only constant have been the aforementioned speakers and the speaker cables. They (the speakers, not the cables) are inarguably the most important part of any HT setup. Once you invest in a good array of speakers, they will stay with you for as long as you have functioning ears. And Sony doesn't make speakers like that.