It wouldn't be as commercial as the other three so it won't happen. I think the Lions should be scrapped altogeher, only adds to the "they're better than us down there" attitude. It helps the teams that play the Lions a lot but does nothing for the Lions' nations.
I think the only nation who Ireland, England or Wales couldn't beat in a test series with the prep an financial backing the Lions have is New Zealand, it'd be close with the other three.
The comments of how Los Jaguares will pretty much be the international side has intrigued me though, it risks the team getting used to superugby and not then being able to make the jump to International, I'd be pushing hard for another Argentinian team because while it will establish pro rugby in Argentina it risks their national team going stale.