I have to agree that a 10mm is not happening. If they can't be bothered with making a mid-size 10mm I don't see a single stack happening.
Hmm, not sure what you consider a "mid-size" 10mm. I've had the G29 since 2008 and it's very nearly exactly the same dimensions as the Glock 19 save for it's thickness. I know that the Glock 29 is "listed" as a "sub-compact" but this pistol is nothing whatsoever like the G26 or G27, it's awfully close to G19 sized.
Maybe the Glock 29 (or the G29SF) is the "mid-size" 10mm Glock that you always wished they made...?
To the subject, my buddy just snagged the first G43 at his local shop. Pistol, two mags, out the door for around $515. I will be shooting this pistol but single stack polymer 9mm pistols are not at all for me. I may love it or hate (most likely it will be fine but not excite me...) and I will wonder in amazement at how long it took Glock to come up with a marketable .380 and then a marketable single stack 9mm.
Meh, no worries. I doubt Glock has much trouble paying the electric bill. Maybe Glock can buy out and prop up Colt.