In 1998 long before BluRay, I bought a mid-fi 5+1 channel system. Cost was around £8,000 but the 40 inch screen was £3,500 of that then. It had a big Denon amp, Ruark speakers, REL sub, Panasonic player. The screen blew after 14 years so I bought a 50 inch. I changed the player to cover BluRays when they arrived.
I have enjoyed this system for 25 years and don't want anything better. Don't want streaming either. By contrast, my 2 channel system would cost £150,000 at today's retail.
It's whatever you want; don't ask us for advice on a question like this. Test dem a high-end theatre system and see if moves you. Act accordingly