Forcing T4&T5 production into PvP zone, removing outer planets from safe zone. All this would be doing is trying to force PvE players into PvP. Which successful games out there which aren't just PvP games have worked doing this? (serious question)
You don't build up one by trampling on the other.
If there are so many people out there wanting PvP, why is it that every single alien core is currently controlled by one alliance, Legion. Are they the only PvP players, or are the others not really looking for a hard fight, but targets instead?
If they are the only PvP players, maybe they are the problem, and they need to disband, so there are more PvP groups fighting each other. After all, there can't be conflict if everybody is on the same team.
I'm not a PvPer. So I don't get the best resources; the asteroids with the high yields of high tier ore, the plasma from the cores. Take away the outer planets, you won't then get to fight me, I'll just retreat to the inner planets. But if you keep trampling on one player base to help the other, eventually we'd get sick of it and leave.
So back to how I started, don't trample on one to build up the other. Build both, help both.