I think the logic is something like Yug's kundali is taking care of the dosh in Gauri's.
So Kali will not remain Gauri's Kaala Teeka and Vishwa plans to dump her on the streets or something.
Before the leap, there was this Swami guy who had said that Kali will protect Gauri for only 19 years. After that she has the power to change Gauri's destiny for the worse too.
Thats why Vishwa had planned to treat her well so that can never happen.
And then the Manjhi Maa dying incident happened and Vishwa went to jail.
Why do you think Taiji has pampered Gauri so much? The revenge goes deeper than just wanting to show Vishwa how unlike what he had wanted his daughter turned out..