i doubt it, first of all the players on xwis want to play ra2 not yr. ppl who want to play yr are allready playing on cncnet. since 95% (made up) of the players on cncnet play modded maps or 50k credits, crates, "no fly", "no attack first 10 minutes!" and other bullshit rules and settings i dont see how that would change once a ladder is implemented. if ppl wil be comming from xwis to cncnet because of the ladder they will still be playing the same people they did in xwis because they share the will to play the same "official" settings.
Im not sure about this but i believe this problem also dictates the RA and TS ladder. majority of ppl playing modded maps in ladder games.
If there will be a ladder there should be a map pool and fixed settings, this way players will adopt these settings. but since it will probably be a small minority asking for this i dont see it happening.