That is a bold prediction.

I didn't even know they released them on the Wii.

l was about to say this lol. I have 2k16 on ps4 and that game is ugly as hell pretty sure the ufc games on ps3/360 look better. Now I havent'y played 2k17  but I doubt that or 2k18 will be much of an upgrade in graphics

Fancy a bet? ;) 

A gentleman's wager? Indeed, sir! What are your terms?

Hmm, how about the winner get's to choose the other's Sig for a year? 

or... middleware that is used to build all games has high levels of scaleability and as devs are beginning to get more comfortable with their middleware's support of Switch, more games will be thrown at it. 

Considering 2K used NBA2K18 as a way to add Switch support to their respective middleware, WWE2K18 is able to refine that further at a lower cost. I would expect more 2K games to continue this trend and use the same PS4/XBO build scaled appropriately to Switch.

With EA doing the same on FIFA18, I would expect '19 games to become Switch as well. (and so one with other teams as they add support for switch in their highly-scaleable middleware)

This is the correct answer.

You gentleman need to set terms of your wager, like when the cut-off is. First week sales perhaps, or should it take potential legs into consideration?

Considering they are annual releases 12 months is basically lifetime. If after 4 months one system is way way ahead then I'm sure that's easy to say whose won. If it's close then we'll wait it out I would assume.