Honestly, I think Majima is one of Hamill's rare swings and misses, but maybe that's just me. Majima also wasn't really as defined a character as he is now, so I'm sure that didn't help.
I haven't played Y7 yet, so I don't know what happens to his character in the story - but I mean, Takei doesn't really seem like the kind of guy to not want to continue a successful project if asked. He guested on the Simpsons for like 15 years.
does this mean well see 0-6 get rereleased again but with English VO added in the west?
I really doubt it, unless it's like a future remaster collection or it's not handled by RGG or something. They just remastered all the legacy games in the new engine for PS4. I think they are done with Y0-6 for a while. If Y7 is a big hit, they would most likely just continue the Y7 storyline instead. Don't forget that they are likely making more Judgment games too. That was a pretty big success for them.