Considering how many manufacturers turn out the 1911, it's a wonder any of them are surviving. A market for a product that essentially doesn't wear out is only so big.
I think the writing is on the wall when one considers Wilson Combat which makes custom 1911s. BUT... it caters to the aftermarket for the Beretta 92 and the Glock to widen its market.
And while Smith & Wesson and Sig turn out 1911s, I'm sure it's only a small part of their output compared to other guns they make.
Also, it's not just the 1911 market. All gun sales have slowed considerably since a year or two ago when the "scare" was on and people never thought of buying a gun did so.
I'm told the AR market has sunk considerably as well because everyone who wanted one has one or two already. Gun stores are loaded with every jimcracky AR variation by many manufacturers