Would you move to a bigger house if you could just to have a better listening room ?

Yeah, sometimes big is too big and when downsizing you are in fact normalizing and upgrading.

@inna And that’s just New England, imagine Montana or Wyoming.

Born, raised and lived most of my life in Western Montana. I built a nice home on 24 acres of timbered mountain side, backed by thousands of acres of National Forest Land. Nearest neighbors were down in the valley many acres away. The house had a large open beam living room, with great acoustics, dedicated to audio.

Would love to have that home and space back, but when you get older, man MT winters get tough.

Now retired and living in sunny AZ. I have a modest home on a couple of acres with few neighbors and managed to put together a very nice 14’x26’ audio room, so quite content for the foreseeable future.

I much discusion here about Large Room or Smaller Room.  If you had this new house, and could design your own perfect 2-channel music room - how would you size it?  

I’d be fully satisfied with a 20x30 room that is fully dedicated for audio with no openings on any side. With most medium-sized speakers and monitors, a 16x24 room in the same design would make me quite happy. The floors would need to have concrete under as suspended floors resonate. The ceiling slant is quite important too. No angle causes the most first reflections. A 30-45 degree angle is too steep and increases cubic volume considerably, making it harder to fill, so a 10-15 degree angle would be my choice.

My room is 19x24 now, but on suspended floors, a fairly aggressive slanted ceiling, and an opening to the mid-to-back right. 

I agree with @feldmen4 and that ilk. I rarely "just" listen to an album. I could be eating or cooking in the adjacent open layout kitchen or watching sports on a muted TV or reading. My total open space is about 15x30, but not an ideal listening space with the irregular openings and windows on one side, but I have the speakers 3 feet from the wall so I have it set up the best I can. 

I could easily take one of the unused bedrooms (less than half the size of what I have now) and treat it perfectly, but I wouldn't listen to my system nearly as much as being in the central hub of the house. Luckily, my wife is tolerant and we have some guidelines, and she likes a lot of what I listen to, but has yet to touch the stereo (other than the volume knob) in 30+ years. I guess if I had a home theater dedicated room, I would try to accommodate a stereo system in that space. However they typically are in basements, and I don't want to spend my time above ground below ground.