It is known that massive amounts of fake currency is circulating in the economy that have been brought in from Pakistan (kind of like a silent proxy war). Even though the current currency had measures to be distinguished from the fake ones, it was difficult to do so by the common person on the street. The RBI chief has mentioned that the new notes would make it much more difficult to replicate and should be easier to distinguish by a layman.
The above, along with the other massive benefits of addressing the black money issue, this move is definitely a winner. The introduction of UPI (Unified Payments Interface) [1] earlier this year and the heavier black money scrutiny will definitely help India move to a relatively more cashless economy.
[1] https://www.quora.com/How-will-the-UPI-interface-of-NPCI-cha...