As announced, Wurren will be target in the upcoming merges and is scheduled to have a +30 planetary field bonus and the number of galaxies increased to 7. I don't think the field bonus is a bad idea (if anything, it will help settle in otherwise unfavourable spots) but the addition of 2 galaxies seems useless and counterproductive to me.
Wurren is target for one single universe, Saros, and the players in Saros will have the option to choose Undae instead, which will turn into 8x eco.
Now, Saros and Undae are about at the same progression level, given that they both have a slow economy, while Wurren, which has benefitted from a 8x eco from the beginning, is terribly overpowered in comparison. As an example, the top1 in Saros would become top2 in Undae while he would fall back to rank #140 if he decides to migrate to Wurren, and why would he even consider that.
So it is safe to assume that most players, if not all of them, would choose Undae over Wurren.
There's no need to create 2 more galaxies to accomodate, at most, a very small number of daredevils. Five galaxies are just fine.
Also, it would create inconvenience for extant players. They set up their accounts for a reach of 5 galaxies. If they want to populate the new galaxies they would either have to wait for new levels of Astro to be completed (which will take a LONG time) or suck it up and pay for the relocations. It is obvious to everyone that none of these options are pleasant.
For the reasons stated above, my suggestion is to NOT increase the number of galaxies in Wurren.