I think the PS is going to have to evolve before airsofters would consider it.
The $400 drop in unit does not include the extra cost for the coil hose and HPA tank and a scuba tank which you need to lug around. Only paintball fields have CO2 and HPA fills on site.
On my AEG, just have an extra battery in my admin pouch that is my back up all day. For GBBR owners, packing gas cans is easy.