This might not be a huge concern for mtgox.

First: it's a big lawsuit so it's guaranteed to take years (not including appeals which wouldn't surprise me).

Second: isn't mtgox owned by a Japanese company now? Where are their servers? Even if coinlab could get some quick injunction to stop mtgox from operating in North America while the suit continues they'd have to actually be able to enforce it. Good luck doing that quickly / at all depending on where mtgox has/moves its servers.

Third: even if coinlab is successful at getting a monetary judgment from mtgox that is where their quest begins - THEN they have to actually go about trying to collect the money from mtgox. Due to the global/international nature of the internet (and the ease at which bitcoins can be "lost") that could also take a significant amount of time.

Unless they can get an emergency injunction enforced quickly, it is likely business will continue as usual at mtgox for quite some time.