That would be interesting.
Last time I was discussing this subject with a LE rep, he said the problem was the lack of sales consistently being reported by the big name ammo companies for 10mm. Maybe they're finally considering the number of handloaders and the increasing availability of the small custom-type ammo companies might offset the sales of the big companies for this niche caliber.
It wouldn't surprise me if there were some scattered (meaning small) interest in a 10mm for specialized LE use, but I've not yet run into any other instructors or armorers for agencies running G20's, myself.
Anyway, the rep is a 1911 fan, and he said he'd been hoping for a SW1911 chambered in 10mm at some point, himself. He said there were some shooters at the company that wouldn't mind seeing the return of a S&W 10mm, too.
You'd think the M&P platform wouldn't be that hard to chamber in 10mm, though, especially since the frame is beefed up with the steel straps molded into it (the sub-chassis), and the fact that the straps are connected to each other via the steel coil pins at each end, held in the steel LB & sear housing, pretty much forming a steel "box" to help mitigate recoil forces in the plastic frame.
That ought to make for a very strong plastic pistol to run 10mm.
Let's hope something appears a little down the road.
I always wished Ruger would have offered at least some limited runs of their KP90 in the originally planned 10mm chambering, myself. Another workhorse pistol.
Happy April Fools Day! 
...I am going to hunt you down and pee in your Post Toasties for doing this!
