Technically speaking, a monk can Abundant Step and bring other people along since it works exactly like the spell.
The described versions of abundant step (both Kate's original description and Eladrin's more recent one) are far more in line with what Dimension Door actually does in D&D than the current DDO implementation of the spell. Again, I have no problem with them leaving DD with a way to use it exactly as it is now, but it should also have the option of using the effect of Abundant Step (whether it's a 'teleport behind an enemy' ability or a 'horizontal leap' ability, dimension door should be able to do it).