There are very few games that even offer coop. The borderlands series has been huge for gamer couples because of this. The fact that they have offer vertical split screen made it even more popular. I understand that all other game producers have shifted away from Coop mode to increase sales. Those that still have it have gotten rid of the vertical split screen. Be true to the Borderlands series, have the vertical split screen option. Don’t start coping other game manufacturers, keep to your individuality, keep being the special series you have been. Vertical split screen, PLEASE 
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Psychichazard
(All out of kittens. )
#3
There are plenty of threads discussing this here already.