People do not like platformers not because platformers suck as a genre of game but because the kind of quality 80's, 90's and 2000's era games had that new platformer games do not have.
there are some exceptions, like the PS3 Ratchet & Clank series and W, that are newer but are still really good. however, games made by Nintendo,Rare, Insomniac, and Naughty Dog back in the 90's and 2000's era that were platformers were excellent games and people wanted to play them. With stuff like Skylanders, Knack (I liked it but it did not go over well with most people), Disney Infinity, and various 2D and 3D perspective ok to good Mario games paving the way for the future of Platformers, I see it becoming a dead genre that will have its place in history next to text based adventure games.
I find this sad that out of the 2010+ era, Yooka-Laylee is seems to be the only Platformer coming out this generation that will be excellent (It better be). Nintendo has not made a 3D platformer Mario game since Super Mario Sunshine, and they are milking people on 2D sidescrollers as that is the least risky of the Platformer classes to invest in.
Anyone interested in Super Luigi 3D World, the next great expansion that continues on the path of excellence Super Luigi U started?