If we take into account the fact that there are the...what, 8 (?) most commonly referenced demon lords coming to the Prime as a result of this..."mishap."
The Abyss, at its most conservative estimate consists of 666 layers....anywhere up to infinite. There's a whoooole bunch of other demon lords whose names we don't know [yet] and countless lordlings who will be all too happy to wrest what control/power/destruction/and followers they can while the 8 big-names are lost in their own chaos-making on the Prime.
Hell, for all we know, the whole thing with this poor drow wizard (surely a male) was engineered entirely by Lolth and while these guys are futzing around on the Prime [note Lolth's conspicuous absence from the "famous demon lords invading the Underdark" line up?], SHE is subsuming their layers as fast as she can.
I think that Lolth is missing because she is a deity, and after the Sundering in FR gods are going to meddle way less than before and their portfolios and power are now set in stone (those would be Ao's new rules). So Idk... it doesn't seem likely to me.