I've decided I am perfectly fine rooting for NJ in this competition if they are playing Mexican opposition. What's good for the league is good for us.Also, I think I would prefer this as well. As much as an all-MLS final would demonstrate the strength of the league, I would be vastly more interested in a Liga MX vs MLS final (especially if NJ is already eliminated).
And I realize the above is a bit easier to say as it provides me "an out" for rooting against NJ, but I think I would say the same thing if it was another MLS team in their place.