First of all, from what I've read in the printed media, the only "'smith" who told the FBI's HRT unit there would be any "reliability" problems with a 1911 in 10mm Auto was Billy Wilson, who hates the 10mm anyway.
It's funny how other well-known, highly talented 'smiths like Heinie, Vic Tibbets, Ted Yost, Peter Carber, Mark Morris, etc., have absolutely
no problem setting up reliably functioning 1911s in 10mm.
Must be magic, hmmmm?
Next, there are more commercial ammo-makers (i.e., those licensed to make, sell & transact in interstate commerce) producing 10mm ammo today than there were 20 years ago, unless you accept some goof's arbitrary definition of "commercial ammo-makers."
There are also more 10mm guns around today than there have been in about the same number of years, with several new entries from Dan Wesson, Kimber, Tanfaglio, not to mention S&W's
re-introduced model 610 10mm revolver.
A power parity?
Let's get serious. Anyone who can read can see that the 10mm has a HUGE power advantage over the .45acp, with an energy range running from mild .40-level loads all the way up to the nuclear zone which no .45acp +P load can touch without blowing up the gun and the shooter. Doing a simple Search here or on GlockTalk's 10Ring will provide the relevant stats confirming this.
Even high performance 10mm ammo whose energy falls short of the nuclear level are still quite hot - such as Double Tap's more recent Gold Dot line-up:
* 180gn GDHP @ 1300fps/675fpe
* 165gn GDHP @ 1400fps/718fpe
* 155gn GDHP @ 1475fps/749fpe
Speaking to Ardent's original question: many years back I switch from the .45acp (Sig 220) to the 10mm (S&W 1076). For my needs, the 10mm cartridge offers the same or better accuracy, more power, more capacity, more versatility of use, and more penetrative ability against intermediate barriers such as metal, auto glass, & various densities of wood. Across a range of possible shooting scenarios, the 10mm brings to the table any number of advantages that other cartridges simply don't.
The only down-side, if the 10mm AUTO has one, is that the cartridge demands a consistent regimen of practice with it to
maintain proficiency, accuracy and good shooting techique. Such skills are perishable, and regular practice is needed to stay competent. I've seen a lot of people, including cops, who for one reason or another won't put in the training time to develop their skills with a 9mm pistol.
For these folks, owning a 10mm shouldn't even cross their mind.
I still like the .45 and still shoot it. It's a venerable old warhorse with a distinguished history to back it up. But it isn't a 10mm and never will be.