MKY 661
I can't imagine why the two old terminals should be re-opened, given that the new terminal is bigger than the 'old' 1&2 combined. I would say that the new terminal is a vast improvement on the previous terminals.
At current pax levels the new terminal is more than big enough [even too big considering how far it is to walk to some of the gates] for the immediate future.
The only possibility I could see, given MoL's current dispute regarding air-bridges, is for terminal 2 to be re-opened purely for RYR flights. However, given the o/heads involved, I can only see this as being very unlikely.