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This should not be the case as banks employees should not be fearing as still people will continue to operate with the banks and not all of them will come to crypto and considering the risk not many would be even ready to indulge in it. Only thing is that payment or transfers internationally may have a drastic effect rest may get reduce but still will continue to exists.
We never know how much it will affect the banking sector in our country but once the cryptos made legal then more payments will be accepted in our country as well which clearly going to affect the number of banking transaction for sure which is the thing the banks don't want to happen.