My impression is that as far as Rotax goes, given the number of Canadians supporting the US-based International Rotax events (the 2 big Rotax winter series – FWT, COA; and the Pan-Am; and there’s also the Northwestern Can-Am series that crosses borders), it’s finally dawning on people that it only makes sense to get rid of the differences between the Canada and US rules.
It seems that Maxspeed (US) and SRA (Canada) are working closer together all the time to ensure that this happens.