Haha no. the game will most certainly bomb all the time, every time if you have a map w/ >3000 planets. 
There's just way too much going on in that for the game engine and the computer system to handle.
In trinity there's a great custom map titled "Star Wars". Like 10 total players and around 600 habitable planets.
Now I pride myself on having a great home built computer, but it lagged like a st. bernard swimming in molasses.  
Personally, I wish sins could put out a top-tier game for high end computers to handle those kind of massive information games, but it won't happen. I'd stick with games <500 planets.