I too date back to the days of Klipsch, Infinity, Polk et al were at the forefront of audio.
I personally owned some of those famous Infinity RS-4's.
Ok, I didn't own the really big megabuck RS's, but in those days $900 or so for a pair of speakers was big bucks out my meager wages.
If you noticed, the speakers of yesterday were often solid, and I mean SOLID wood.
Klipsch were advertised as being furniture that happened to sound good.
My RS 4's were some heavy pieces of furniture. 1/4" (?) thick oak veneer over solid hardwoods. Solid internal bracing. About 90 lbs apiece. Drop one of them on a toe and see what happens.
So what happened to these companies?
The desire to sell more units, to be profitable. Basically the choice of selling furniture, or selling speakers. Selling to the masses, or selling to a small group of fanatical customers. Look at automobiles. How many companies making exclusively $200k cars could survive in the market today?
Even back then, you saw "entry level" speakers coming from these companies. Something that you/me could afford. My RS 4's are not "serious" speakers. They were a budgetary compromise to get a sub $1000 speaker on the market. The same goes even more so for the RS 5's and 6's. Klipsch Heresy's were far removed from the K-horns and it brothers and sisters.
Today, I own Polk LSi's. I like them. Give me a year or two, and I will tell you if I love them. The LSi 15's are Polks marketing effort to have a main speaker aimed at the under $2 market. Does a pretty good job in my opinion. Are there better speakers on the market? Sure. For less money? Maybe, but I don't think so.
Are those speakers "furniture grade". No way. Will I own them for 10 or 20 years? Nope. And I would not own any of the competing speakers on the market for 10 or 20 years either.
The market has become "disposable". Solid furniture that will last a life time is being replaced with a functional model that will last a few years.