I think the discussion of the effects of an 18-game vs 16-game conference schedule on RPI, and how that affects at-large selections, is overstated.
I believe the committee looks more at the individual games that a team wins or loses and the RPIs of those opponents than the RPI of the team its looking at. That has been fairly well-established over the past few years as the selection process has been a little more public.
If the two extra non-conf games were filled with good RPI opponents that raised the RPI of MVC teams, then wins against those MVC teams by other MVC teams in conference would look better. Let's say Evansville picks up a couple more good OOC opponents and it results in an end-of-season RPI of 48 instead of 63. If CU and WSU both sweep UE, that's two more "good wins" on their resume, even if they are somewhat muted due to being conference wins. On the flip side, if UE filled those spots with poor opponents and their RPI fell to 100+, then a loss to UE by CU/WSU would look worse.
And what if the unbalanced 16-game schedule gives a top-tier MVC team one or two fewer games against the better MVC opponents? That could hurt their resume, as well.
Bottom line is, the opportunity to schedule two more OOC games is as likely to have a negative result as it is a positive one, especially considering how difficult it is to schedule good OOC games.