"The 1911 led the way to the adoption by the armies around the way of a semi-auto sidearm. Not 1911's, but most of the other countries followed the US in the transition to semi-autos."
Actually, the United States followed quite a few other world militaries, so we were closer to the butt end of the spear, not the tip.
The Germans, Japanese, Danish, Italians, Romanians, Austro-Hungarians, Portugese, and Swiss all adopted semi-autos before the United States. And, at the time of adoption, I believe each of those nations had armies larger than the US.
"Also, were not the semi-autos preceding the 1911 all of 9MM and smaller caliber?"
Yes, but that has more to do with the way that other militaries viewed the handgun in service usage than anything else.
The larger caliber was, by and large, a dead end in military service. The US, Britain (half heartedly, more as military expediency) and Norway were the big adopters of .45 caliber.
Most other nations went 9mm or smaller.
Sorry, I still can't see my way clear to saying the 1911 was really that ground breaking in terms of short or long-term impact.