It is quite likely they'll be back. They've earned fortunes, I guess at least several thousands of Bitcoins. From the start it was clear they were going to scam people, and despite countless warnings people gave them their money. They all hoped to get a slice of the pie.
If they come back, people will just fall for it again. They can use their well-known name to earn more.
And after that, they'll pull the same with a different name. Or that process is probably already in place.