With the standard disclaimers of I can only comment on what I know and this is not an official statement, etc…
There will be no migration tool from V1 to V2. It’s possible there will eventually be a tool from V2 to V2 (in case of hub replacements). If that happens, it is also possible (but less likely) there will be one from V2 to … whatever comes next.
V1 isn’t EOL until it no longer connects to our platform. That may happen someday, but it hasn’t happened yet. That said, I wouldn’t expect updates for it unless it was something serious and/or security related.