FNs and Brownings are beginning to hit the collector side, you will pay for those. If you are wanting a shooter, look at the Springfield offering. Everyone wants THE FNs and Brownings but, don't want to pit the cash down for one. Most that have them for sale think the have a gold mine.
It's amazing that every time one mentions 45acp that the conversation immediately turns to a discussion about the 1911 pistol. Love it!!
The cartridge will never be obsolete or replaced. If loaded to its safe potential, it's hard to beat as a do about anything cartridge.