in May of 2005, I bought a brand new 12.2 MP Nikon D2x for $4999.95...today, I could buy a used D2x from the same, exact camera store, for $275 used. So, in 11 years, Nikon's highest-resolution camera has gone from 12.2 MP to 36MP, a three-fold increase. i think you migth have missed the humor in my original post, with the words "obsolete" and "low-megapixel" in quotes as a way to show a bit of wry humor, but it's worth taking a look at the fall of camera prices over a decade-type type frame.
So, in another 12 years, you do not think we will be at 180MP? Canon is already at 50 MP on 24x36. TODAY, I could buy a used Nikon D800 from the same store (the one with the $275 vs $5k D2x) for $1,200 with box, and accessories. The D800 when it was a band-new camera was, I think, $3499 a few years back. Then went to $2999 for a spell.
I have a feeling that within a short time, the very,very popular D800 and D810 cameras will be selling for $500 used; these cameras sold fairly well. The Canon 5D classic, $3,499 when it premiered, is now a $450 camera. It had/has 12.8 MP; today its counterparts have 50MP, a four-fold-plus increase in MP count.