Dual SIM in India at ~$100, the root of new consumer behavior

Cell bharat reports that SAR Group and Wynn Telecom will launch dual SIM in India at ~$100.
Dual SIM are becoming very popular in India and experts have questioned the relevance of Number Portability in light of consumer's ability to afford and use 2 Sim cards. Consumers now subscribe to a steady plan from an operator and keep the other slot for the lowest deal available and baragain hunting. This way they have the assurance of quality and coverage while using the cheapest plan opportunistically through other SIM.
This behavior has also raised questions on the feasibility of number portability in India.