Ech, depends if right gets em first (which they probably would). It would be up to the left people to either eliminate the rights or take those desert planets! So it would be good for the lefts to ally and the rights to ally, probably make for a fun game!
And remember, if the pirates don't get wiped out, the guy controlling the desert planets is gunna be a prime target for pirates if he's got lots of bounty, so he'd better watch out!