Yeah, there's plenty of .223/5.56 weapons to be had these days, but about all that they have in common with the Mini-14 is that they all share the same cartridge.
In other words, in a world awash in .223 rifles/carbines, the Mini-14 is purty-much a stand alone platform...so no, there simply aint no real "alternative" for someone who wants a handy, old-school, carbine-length, .223-Cal semi-auto rifle made from real-steel...hence my prior comment on the matter.
As for answering your specific question, I really can't say how many people would pay that much extra to get a new Mini with a re-popped folding stock. What I can say though, is that I'm purty-sure that if Ruger thought that it'd be profitable, they'd have already dug it out of the mothballs.
At any rate, your point on that is well taken.
DGW