WAP-4 and WAG-7 are NOT demolished. These Locos will be with us till 2030 I think.
I think CLW will produce their parts in their stores after stopping production of these from the coming month.
But what I can tell you that 90% chance is there to use WAG-7 and WAG-5 for passenger traffic completely in future(Which already has started) as because WAG-9 can handle the Freight sector completely in future.