"What was the main factor that motivated you to reunite after calling it quits in February 2008?"
A large aspect he neglects to mention is that heavy music is once again something that will sell tickets. In a few years the cycle will put them back in a position where they'll have a hard time making money playing their style.
I don't know if heavy music ever stopped selling tickets, I think it's always been relatively popular. Bands like The Ghost Inside have been slaying for the past 6 years or so.