They should transport the mobs to the AE for people there to fight random enemies that 'just show up'.
I'd be happy if it was just more obvious that the DS was active. I've always said the mobs should be invisible and untargetable for the duration of the power. That or some really obvious aura that you just couldn't miss. But for now if they'd just fix so it at least worked like it used too.
My level 50 Dominators:
Madame Mindbender 50 Mind/Energy
Fly Agaric 50 Plant/Thorn
Nate Nitro 50 Fire/Psi
If they used the same coding from the placate proc that could be pretty useful...but I'm not sure how they could code it to ignore everyone else...since placate tells them to ignore the caster.
Interesting idea though.