One positive approach of this rule could be like this:
A person can book 7 tickets per month including Tatkal. Now with new rule it will be limited to 6 only, it will also reduce in Tatkal booking as multiple id dont work during Tatkal hours as only 2 tickets are allowed per IP address.
It will reduce the load during Tatkal hours and normal and genuine passenger can book ticket with more ease. While only Agents had to worry over it.