My knee jerk reaction (especially since I'm a regular Jeggings wearer is) NOOOOOOOO!
However...
There are some Jeggings and ponte pants that are structured enough to pass as pants. Again, it really depends on the fabrication and cut. The said leggings must not be obscenely tight.
I personally wear Jeggings and structured ponte leggings on a regular basis because I sport the long over lean silhouette a lot. But I wear them with tunic-length tops (at least 2 inches below crotch level) only, nothing less.