I don't have any doubts about that, but I really don't think he will push himself to do so. Especially if Portugal somehow manages to win their first World Cup this year. Then Ronaldo would have no reason to come back for another World Cup appearance.
It would be a shame if Neymar quits playing for Brazil by the time 2026 is here, but then again he started at such a young age and maybe he's ready to let other young talent fill his role and rise to stardom.
Absolutely I agree. Neymar's ability to influence younger generations is very high. I hope they are positively affected.