Overall, this seems like a good change.  Anything that prevents abuse at the expense of other players is good. 

What about creep names?  Seems like we should limit creeps to 50 characters also, else someone will just create a bunch of creeps with 50kb in the name, and just put them in a corner of their room.

Just one more point I would like to make, is the technical burden for remote mining.  As a new player, I still haven't dealt with remote mining, since it would take a significant time to get code that would result in a profitable operation.  Right now, I am more focused on immediate issues inside my own rooms.

If you make is such that we need this power creep to boost a source, I fear that will just increase the burden of remote mining for newer players, in terms of coding (and cpu).  

I 100% agree that higher player remote mining operations are too profitable right now, but on the flip side, if you reduce those profits, you will make it such that newer players will almost never remote mine.  I would like to see a balance that limits higher players, without harming newer players.

I am very late to this thread, but just wanted to say that if we require power creeps to "boost" sources, that is heavily favoring higher GCL players, while heavily punishing newer players.  It takes a very long time for new players to even get to the point that dealing with power is even worth it.  We are dealing with more basic stuff like just getting our rooms to function.

If you nerf remote mining, that only helps players like Dissi, who already has stock piles of power, and he can easily afford to boost his remote mining operations.  The newer players will basically never be able to remote mine due to this nerf.

Maybe you plan on making power more easily accessible to new players, if so, then that might help.  But if not, then I see this change just making a larger gap between older players and newer players.