I like my desktops, I have had the same boxes for years, if domething fails then I replace it without too much of a problem, for example Hard Drive or PSU . If the mobo is under spec I can upgrade the RAM or replace the mobo completely.
There is usually some bargain to be had at my local Electroniics store. Probably because the trendy crowd are buying all the bling bling techno gadgetry that you can't fix by yourself.
My own view is that the desktop market has matured to some degree, but I think that with some creative marketing and some up to date designs it could make a comeback. I beleive there is still a lot of mileage in the desktop.
I have a notebook and it works really well, very impressive. When I say "notebook" i mean one that is made out of paper and you write on the sheets of paper with a pencil or pen, it's terrific. Look at the advantages:
Simple low cost manufacturing process.
Uses no power in either standby or operational.
Does not crash or suffer software glitches.
Does not need special handling when it is trashed.
Breaks down with very little environmental impact .