They won't go away because
a) there is a market for this stuff.
b).....
You know you don't actually need a b), because that is all that matters. Realistic games sell well, so they aren't going anywhere.
And am I playing different games than everyone else? Gears 2 was one of the best looking games I've ever seen, both from a technical standpoint and an art design one. Each level had a very different colour palette, none of the levels were just "brown". Halo 3 is ridiculously colourful and has a wide variety of weapons and vehicles to choose from. What other games have an over sized vehicle chewing motorcycle with dual cannons as a way to get around?
Also, this trend of praising "silliness" in games as being the most important aspect is getting on my nerves. You can't read a thread these days without someone wondering why there aren't more games where you play as an Australian deep sea diver who fights cheese men from mars by firing hot dogs out of a bazooka while attempting to seal off an ancient tricycle riding evil kitten who wants to make everyone in the world dance to bad music.
Sure that is creative, but it is also the worst fucking idea for a game I have ever come up with. No one would buy the damn thing.