Getting rid of these ridiculous franchise ideas would be a start. You can replace the Super 15 with a SH Cup (similar to the Heineken Cup).

Problem with that is that from South Africa you will still have the same 5 teams every year because Griquas, Boland, Valke, Pumas and Leopards (to name a few) cannot compete with the Sharks, WP, Bulls, Lions and Cheetahs.

If you go on the same way it is now, they should not make it more teams. They should replace teams.

Distance itself with travelling to Argentina is not the problem, but like you said, the number of matches played overseas is a problem. Including South America in the SupeRugby league is no problem but they should go back to 14 teams (4 from each SANZAR country and 2 from Argentina)