You may have covered this up thread and apologies if that is the case but how tied are you the the family having access to the kit?
None of my 5 kids - aged 15-36 - make any use of hi fi. They all get their music from their phones. One uses Sonos, another has some lovely little Ruark bluetooth speakers, the rest use Spotify via various bluetooth speakers or headphones. To put this in context, one of them has a music room with 6 guitars, valve amps and a block of pedals. He has a small Richer Sounds system I bought him when he was a student but only uses it to stream Spotify via a chromecast type gadget
About ten years ago we created a smallish second lounge ( 10 ft x 14ft) at the back of the house and I moved the hi fi into it. We found that, if I was playing music, especially jazz, everyone else went to different rooms and I had to fit my music playing around others use of the tv. We do have the rest of the house kitted out with various Sonos speakers which actually sounds great, esp the bigger play 5, which everyone uses. If any of the others had CD or vinyl collections I may have gone down a different route but the hi fi is now seen as a quirky old mans project. They'd all be welcome to use it but in reality no-one does.
It tends to be the case that I'm the only person who listens to music as a single focused activity - everyone else has it on while they're doing other things so this works well for us. A while back some good friends told us that the secret to their happy relationship was having two lounges and re-purposing the back room, which became a spare bedroom when older kids moved out, has certainly helped!
The point being - are you sure downgrading will lead to the increased use of the system by others? ( For this to be a solution it is, of course, all premised by you being lucky enough to have flexible space)