User blog comment:Willbachbakal/My BioShock Sequel Idea Dump/@comment-1999649-20111015115430/@comment-1330314-20111103004118

Responding late:

Personally, I don't think the BioShock series is designed to have large enough areas to allow for vehicles. New Rapture, large as it'd be, would still be smaller than Rapture entire, and so wouldn't warrant the need to include vehicles. However, Plasmid combat on vehicles could be very interesting indeed, in proper context...