I'm not sure how accurate the buzz about NK going off air is,its viewership has started to improve and last week it was back in the top 20. Also, introducing a new show during IPL is very risky.
For the channel to consider a generational leap, the show needs to have been a strong performer and NK was decent not a top performer, and the PH and leads are not powerful enough.
I think generational leaps have gone out of fashion, and they have stopped working too, a couple Zee shows tried it last year and none were successful.
When Swaragini started to struggle, the channel didn't think of generational leap. SSK and Thapki introduced a new generation beside the old one and both didn't work. I doubt the channel will consider it for Udaan and I don't think the channel values Udaan that much.
Hopefully the show keeps doing well and we don't have to think of this possibility