players can be legends in different ways bruh. we both know that.
del piero never won a ballon d'or yet he is regarded as best juventus player ever.
edit: also why do we care about national performances when discussing juventus players?
To me Dybala is not a Juve legend, yet. He is in his 7th season with us and so far he had 2 very good seasons, 2 average and 2 weak. To me it's undecided yet what his status will be.
So far this season he looked very good almost always when he plays. Allegri certainly knows his place in the team and how to use him best. If Dybala makes a very good season, signs a new contract and in the next 4 years has 2-3 very good seasons with us - he'll be a Juve legend for me and most of the other fans.
I think he is capable of that even if he is a bit of a nuisance in the modern football where physical attributes like speed and strength are key, I actually like his quirky style when he is in top form. I like his ability to dribble in small areas and to link the play between midfield and attack.
For me it's up to him. If he fails it will be his own fault because he has the talent to leave a legacy for Juventus. Even our coach rates him highly and knows how to use him best. He has no excuses.