Building a CASA franchise requires a lot of effort & also experience. To get a customer to keep money in CASA, the whole payments apparatus has to be built including bill/utility payments etc.
As an example IDFC Bank has tied up with Zerodha, to build a seamless account like ICICI Direct, wherein the customer keeps some portion of the money he wishes to deploy in MFs and Equity Share purchase. This is a Win-Win for both, given that Zerodha is crumbling under the weight of operations right now.
In essence it involves building the plumbing/works for the flow of various types of payments through a CASA account.
IDFC Bank has been building the plumbing so far, hopefully Vaidyanathan will take the infrastructure and quickly scale it up. I think the liabilities target is not a lot, given the size of book of Capital First.
It will be naive to assume that most banks have built in the infrastructure/plumbing for CASA. ICICI Direct has been a very successful product (although at a decline stage of product lifecycle). How many banks have been able to successfully imitate that.