I agree for the most part. The 1911 and the .45 ACP aren't going anywhere any time soon. The question of whether or not they are obsolete is really a rather silly one, because the very word "obsolete" means something is either no longer made, or something is based on an antiquated design. Though Browning's original design might be considered antiquated, it has not remained unchanged, and the design has been continually "tweaked" for over a hundred years, and is still being tweaked as you and I confer.
As for the .45 ACP, it's actually younger than the 9mm Parabellum, as that cartridge was developed several years before the .45. The only thing that has remained consistent with either cartridge, is case dimensions. Improvements in propellants and projectiles is ongoing.
Though the 9mm might edge out the .45 slightly in popularity, the. 45 is by no measure any more obsolete than the .22 LR., a cartridge far older than both, that actually sells more than either the other two (due to its use in pistols and rifles and its relatively low cost). Though I read these articles, it's a debate that really seems to be a waste of time.
On another forum I belong to, a member recently shared a photo of his Glock 19, his new Labrador pup managed to get a hold of. The pup turned that polymer frame into a very expensive chew toy. Another member pointed out, that had he owned a 1911, the pup might have destroyed the grip panels, but the gun would still be usable. I agreed, any metal framed firearm would have been a better choice with Cujo the Glock Chomper around.
"Better," is a very subjective term.