Nice ranticle, dude!

I think that selling a game as an MP experience only is a different kettle of fish than selling a mixed/SP one. Every R6:Siege and CS:GO has ten For Honors and Evolves.

Being greedy or skimping on things to do in MP is probably the biggest problem.

There will always be a market for pure SP though so you can rest up. Even if MP modes are often shoehorned into SP games (Uncharted, Tomb Raider, AC), you can ignore them, they are often surprisingly good and don't seem to have diverted much from the meat of the single-player campaign.