AC Milan and Inter Milan are already big teams and often enter the top flight but if Udinese can take advantage of opportunities and continue to give their best contribution to team work then they can also enter to become champions.
It's weird to speculate that Udinese can become champions in this season. If it becomes true, it is like another Leicester City and chance to see it is very rare.
It only happens if Udinense has a perfect season and if other clubs all have troubles and under perform in this season. Together, I think chance to become champions for Udinese is very small.
If you imagine when Udinese against the upcoming big team it was indeed impossible, but they got a victory especially at this time they were undergoing a long rest and would compete again in October so that the condition of the players had returned to recover with full force.