I disagree with this petition, and that is because it should be edited and the words should be enhanced a little bit
First of all, i don't agree on removing anyone's bases because there are new rules being implemented after the base is constructed and already working. I agree on moving the bases instead of removing them and the 15k is good distance but only from mining fields, Jump holes and Jump gates. The installation that are 10k away from NPC bases are okay and have no problem, and should not be touched.
The installations that are less than 10k to any NPC bases, should not be allowed to use defense platforms at all OR allow the admins to move the base 10k away from the NPC base and therefor they will be allowed to build their defense arrays.
I think you should be very very careful with decisions like this, because you made the construction of bases very hard, and take lots of efforts and time. Also you made the destruction of bases very easy and require nothing but so weak minimal RP and a group of capital ships even if it will make no sense in RP about the amounts or the existence reason, SO, accordingly you must be very very careful with such decision so you don't end up with masses of bases owners and clients feeling upset and leaving the community.
Good luck, it will require lots of formal discussions and try to listen from everybody, not only those who are famously known by hating POBs in general