@Gobinaath bro, the congestion may decrease a little, only due to reduction in second sim and not due to reduction in data usage, imho. For example, the last hike was during Dec2019 and tariff hike was about 45%. Even then, usage was not reduced and congestion situation didn't improve at that time.
Data is like alcohol. Whatever the price increase may be, people will moan, cry, make memes, but will buy eventually. People who use mobile data responsibly has already moved to fiber for heavy usage. I am sure many people here in our forum will prefer Rs1498 plan with 24GB/year + 50GB topup (Rs251), than 3GB/day. Those who use mobile data exclusively as BB will continue to do so. I am not saying no one will switch to BB, but that number will be not so big, that it will have minimal effect on congestion, imho.
Sure, Some people may shift from 1.5GB per day to 1GB per day (or 2GB to 1.5GB/day). But since they will have that feeling of "PAID TOO MUCH MONEY FOR DATA" in their mind, they will have the guilty, if they are leaving that daily data unused ==>> No unused daily data ==>> Not so much improvement in congestion.
So the final improvement in network will be good, but will not be that much drastic. Only way for getting drastic improvement in network congestion is REMOVAL OF DAILY DATA, imho...