I think it's entirely possible they won't come back, but I think it's utterly stupid to think they don't want to if they can.
This is exactly my thought and the twitter statements reflect that. Their intention seems to be honest business regardless what people write here - the question is are they able to do it, do they have access to backups, do they have access to the wallets and bank accounts and do they feel safe about everything?
Is there any evidence that the authorities have control of the servers or the funds?
It seems that there were warrants for Equinix datacenter, but it is very vague. Also, arrest happened Monday morning, trollbox offline Tuesday morning
https://btce.penek.org/trollbox/ - so it could be that the servers were kidnapped by USA but with doubt, because normally servers are taken before or at the time of the arrest or let it be running as a honey pot and this let me wonder, where is the big fat "USA seized your money" logo?
But the first twitter statements indicate that they indeed thought it is datacenter problem because servers were hijacked by USA.