Neymar is getting awfully close, if he can show longevic consistency as the best player in the world at the club level once the Messi-Cristiano dichotomy breaks down, maybe he can surpass Ronaldinho. It's just Ronaldinho's prime, while it was more fleeting than other legends, he showed us the kind of inginuity and creativity that even very few of the all time greats could match. For three years IMO from 2003 to 2006, he was simply unplayable. He dominated matches the way Messi did but he did it with such combination of grace and flair that are what make his prime truly distinctive from the rest.
Neymar showed he has the capability to dominate matches with us like his predecessors. But he has yet to really do so in a match with Messi in the lineup. Until he does so, I find it a bit premature to say he has even reached Ronaldinho's level, let alone surpass him. He's yet to win a World Cup too.
Love the guy, hope he continues to achieve with us and show some class for Brazil but he's gotta do more before he's even on Ronnie's dimension.