I thought last gen was a bit too long so I want this gen to last around 6 years for each console. 

I want it to end now

Why??? 

PC gamers will want it to be shorter because consoles do hold back, in their later years, development on PC games but not as much as PC gamers believe.

I think it will be shorter but I also think this could be the last great generation so don't want it to end.

Shorter, they Will probably need to in order to compete with other platforms.

There's only one good console, so boring. lol

But really I wouldn't mind this gen being on the shorter side

Shorter. I want new consoles in 2018/2019, and Nintendo should be sooner than that.

When you see already what they can do early in the génération ( driveclub, uncharted ) , i dont know how you could want to spend 400 again , it will be more than enough, more will be superfluous

Isn't this generation supposed to last ten years or something?

Good games take longer times, short generations = less good games.
Its that simple.