So this is just a thought I had, I know it's kind of crazy but its just something I thought of and thought I would share.
I think it would be really cool if you could cross archetypes kind of like DnD, meaning when you level up you have the option to add a level of another class. It would be really cool to be able to take some more blaster abilities as a Mastermind or some more defensive abilities as a Blaster. Then, you could scale the damage, resistances and what not depending on how many levels of an archetype you take.
I realize this would open up a whole can of worms, there would be a million of things that would need to be clarified and math to be done.
Less of an idea, more of something I just thought I would share