Naruto is Goku.
Boruto is Gohan.
Boruto will never surpass Naruto. Chances are, Boruto retires from being a shinobi when he reaches adulthood. Similar to Gohan retiring from fighting, when he became an adult.
Because Gohan never surpassed Goku.
Oh, wait. Yes he did. Twice. Three times if you count fighting Raditz. Gohan just doesn't train much, but when he does, he kicks Goku's ass.
Hybrid genes and "special rage boost" are the only reason Gohan was ever on Goku's level. Plus Goku not trying to get stronger during the Cell Arc, but relying on Gohan to beat Cell. Which got him (Goku) killed in the end.
Rules in Naruto are different.
Another analogy
Naruto is Hiruzen
Boruto is Asuma
Mystic Gohan>SS3 Goku , which I consider their final forms
Well, I suppose ss God ss canon but toriyama is just milking at this point
How about this example
Naruto is minato
Boruto is naruto