The Webley is a niche gun, obviously, and not something that is going to take over the general market. It's not a superior revolver in any real sense of the word.
Even its contemporaries were better (Colt & S&W) guns, stronger, firing more powerful rounds, better triggers, better sights, etc. What the Webley has is its "aura" or "mystique". Its the last military top break big bore revolver.
As a general market item, it's not going to be a success. As a niche item, a limited run collector's piece, I'd be willing to bet they could sell every one they make.
No old machinery or factory left.
There is this, but I'm not certain it about the machinery. Remember, we are talking about the English here. It's not impossible that the old tooling, jigs, etc., are sitting in storage somewhere, oiled and tended by the grandson of the guy who put them there in the 1920s....
Colt stuck their old machinery on a loading dock and let it rust. But Webley? who knows? We are talking about the British here,
in 1940, desperate for arms to repel the expected Nazi invasion, The Admiralty sent some fellows to the Dover coast to look for good places to put railroad guns (battleship guns), and was desperately looking for some of those guns to put in place (without a great deal of hope of actually finding any). And it would take months, at the minimum, to have any made.
The team found some good spots for the guns. In fact, they found those good spots already prepared for the big guns. And, backtracking, they found a pair of railroad guns (12" I think, maybe 14"), stored in tunnels, tended by a small detachment of caretakers, who had been oiling and doing maint on them since 1918! until this "discovery", the govt had no idea they were there!
SO, maybe Webley has a hole card to give them a leg up making the MK VII again?
I've got this, its a 1917, and I really like it a lot. But, considering that I paid $125 for the gun when I got it, and a decade or so later, $40 for the web gear, I won't be paying $1000 for one made next year, or the year after. Not even remotely worth the money to me.