If ND won't patch these maps into the game, the alternative is to remove the toggle, and make the Map Pack Bundle the only downloadable version on the PS Store. Then turn the default pool off and have a pop-up saying "Download the DLC maps to play online" when ever anyone tries to play without downloading the maps.
Booyah! One giant player pool with less lag, and all the maps will have a fair chance of showing up.
But doing that makes sense... i.e something Naughty Dog won't intend on doing.
They need to seriously stop Dry Docks and London Streets coming up all the time.
Almost every voting screen I see one of those. Everyone is bored of playing the same maps.
I had dry docks and london streets often with another map. thankfully I had a party and managed to evade them most the time. I shouldn't have to party up to evade them though.