MarkB
Legend
He's not meant to be the next big hero specifically, he's meant to represent the movie's message of hope - that anyone can answer the call, and that while not everyone can be a Jedi, a Jedi could be anyone.And the kid using the Force on the casino planet isn't much help since it's a generational seed taking root and wouldn't help the next movie unless Rise of Skywalker had been set WAY in the future.
Which, of course, was promptly and thoroughly squashed in the sequel as Rey is rewritten to be a combo chosen one and honourary Disney Princess.