I think they'd be too short.
Nothing feels better than being on a nice long powder ski and just being able to blast everything without worrying about stability.
Racing lengths are a little different, same with park skis.
Rocker does make it ride short, which usually makes one want to go a length up.
I've used these examples quite a bit lately, but it's good proof.
I know a kid who is about 5'8", and is skiing on 192 Salomon Rocker 2s.
I also know a girl who is 5'0", and is on 168 Moment Night Trains.
Both these skis go above their heads, and they love it.