I've always wondered why there wasn't a Browning 1911! It seems like such a no brainer.
I thought they should have some pretty basic models, like a first edition style (non -A1) 1911, and a 1911A1 model reminiscent of the ones carried in World War II. They'd sell lots to collectors who would buy these just to
have them, maybe not even shooting them.
Then, if they wanted a bigger share of the pie, they could make something like Colt's XSE, with all the bells and whistles like the beavertail safety, etc.
As to the .45 A.C.P. High Power, I don't see why not. It would be like the CZ 97B, which is a .45 version of the 9mm CZ 75B. The 97B is certainly a little bigger than the 75B, but no one complains that it lost the ergonomics.
http://cz-usa.com/products/view/cz-97-b/
Anyhow, new models don't seem to be a priority to Browning.