I think America and Japan are too far away from us to be playing rugby against them week in week out.
America, yes. Japan, I disagree. I mean, it's a matter of opinion but you'd only be doing it once a year, even if they are in your conference. It's only 3 hours worse than Perth.
Furthermore, Japanese rugby is a corporate wank fest. The teams dont make money they are just a form of advertising. It would be a lot harder to include them into an expand super rugby than many realise, and they would not be competitive at all.
I don't think anybody is posing that you simply elevate teams from the current structure, more that licences should be sold to investors. Think how Italian rugby is set-up which is far from perfect but can be implemented fairly quickly and seamlessly.
The only way I can see this going is splitting the comp into 2 x 10 team conferences, an Aus/NZ conference and a SA/Argie conference.
I would say that this is the most reasonable and realistic approach that is achievable (maybe 4 Argie teams is a bit far) but I would still like to see an Asian presence, possibly with a large amount of pacific islanders playing for them. A privately owned Tokyo and Singapore team is doable in my mind.
I know people have their eye on Hong Kong because of the 7s but the reality is corporations are moving from HK to Singapore in spades and Super Rugby teams in emerging markets are completely dependant on the corporate dollar.