How about around 4-5? New powersets are nice, but it would be really cool to see the existing powersets get some new abilities. The level cap could also be raised to 40 or something, so we could continue leveling to unlock the new powers.
The powersets we have already severely under-utilise the majority of powers available since the advent of AM. Quantum, as an example, has an entire tree that is almost useless for the Quantum Advanced Mechanic. The only power in the Space tree that qualifies for power regeneration is Gravity Well. Nothing else.
Good lord, no. They've already wasted so much time on powers. This would resolve nothing and be a ridiculous waste of time and money.