Of course the signature campaign will stop. Why would they keep paying money to advertise a service that doesn't exist anymore?
The campaign thread managed by Lauda is already locked. Some people reported that they received their payments this last few days. Not sure about the other users.
Lauda, she was worked exponential by managing this and tracking high number of people in SMAS list for forum's goodness. I personally, worry about Bitmixer's closing statement by team. They are one bestest bitcoin mixers who have been done great job. Cryptomixers and others wasn't compete it that much with them.