Well adding more random or dynamic factors I'm sure could keep things interesting and add new challenge for hardcore veteran addicts.
But for those of us who haven't been playing since release, and don't have these algorithms plugged into our brain to allow us to accurately evaluate completely new units and capabilities on the fly, it would seem to just inspire confusion.....
Dominions is like some kind of crazy Rock < Paper < Scissors < Hammer < Burlap Sack < Machete < Wrecking Ball < Body Bag < Chainsaw..... kind of progression, and constantly adding or removing steps in that can ultimately lead to a newer player discovering more of the innate truths of the game, but it'll do nothing for helping them develop consistent results from a predetermined set of capabilities.
My point being, that it seems most people consider it very risky, (bordering on suicidal) to play in MP without S/D/B access, so getting used to a mod that allows you to play most nations competitively without strong investment into those paths (and their associated schools), would make a less experienced player much weaker in vanilla MP games. Currently it's not so viable to really focus on the 1-2 paths that most nations start with very strong access to.
God I could just keep typing. What I mean to say is, I want to see more late game summons as viable alternatives to what is already available. I want them to be so compelling and strategically interesting, that they are included in all MP games. I also want a pony for Xmas.