Since Marsans Group wants (according to some newspapers from Argentina/Spain) at the moment selling AR I think AF can be an airline interested about AR.
1.-Because AF/KL is an airline which don't want allowing IB continues being the main european airline serving LatinAmerica.
2.-SkyTeam needs a carrier from the Southern Hemisphere in order to compete on an appropriate way with Star and OW. (SkyT is the smaller alliance in the Southern Hemisphere) An Aerolineas controled by Air France could be a SkyT member. And SkyT could having a new carrier and a new inter-continental connection on the SYD-AKL-EZE route.
3.-Besides, the South American market also needs a SkyT larger presence and more internal competition between airlines and alliances. Sky's presence nearly there is not in South America and other countries below the Equatorial line.
With AR and MH, SkyT could not need more airlines members to cover an reasonable worldwide network.