This sounds more serious than thatI think you're slightly misunderstanding the plan (assuming I have interpreted your post correctly)
[ Edit: I just re-read your final couple of paragraphs and you're basically saying the same thing I wrote below ]
Effectively WoSign's (and StartCom's) current root certificates are now dead and useless for any new issuance.
Under Mozilla's proposed course of action, existing end user certs that were signed by those roots are valid, but there will never any more.
But, at some point in the future WoSign and/or StartCom can generate new root certs and apply to have them included in Mozilla's CA store.
That "point in the future" is June 2017 for WoSign and maybe earlier for StartCom if they can prove that their not controlled by WoSign (it seems unlikely that they can prove that). Their application process will need to demonstrate that they're resolve the issues that got them into this trouble
