I don't even want Georgia joining the 6 nation's either.
http://stats.espnscrum.com/scrum/rugby/records/team/match_results.html? id=2019;team=23;type=year
Japan's results every year. Their form since 2015 against tier 1 teams is poor and a lot more solid in 2019.
I think world rugby should find other Asian projects and build the region using the Japan model for other nations to aspire to.
Looking at the rankings and some recent results Korea And Hong Kong could be in a similar position to Japan in 4-8 years.
The argument that joining premier international competitions benefits a growing international team can be mooted by referencing Italy in the 6 nation's and possibly Argentina in the Rugby Championship.
I hope rugby grows in the Americas and Argentina play there instead.
We still don't even need 20 teams in a world cup yet.