If you look at the biggest selling MP game (on consoles) it seems MP only matters to about 17% of the console gaming market at most. That's a sizable chunk of the market to be sure, but still only a small minority of gamers.
MP certainly doesn't matter to me. An immersive SP>>>>MP any day.
“The fundamental cause of the trouble is that in the modern world the stupid are cocksure while the intelligent are full of doubt.” - Bertrand Russell
"When the power of love overcomes the love of power, the world will know peace."
Jimi Hendrix