Using two numbers in a single handset is a popular phenomena in countries like India and China. With two sim cards in a handsets users gets an edge of using professional and personal calls in his phone. Apple is well aware about the popularity of dual sim phone in few countries.
But It seems feasible to have your iPhone with dual sim as Apple has filed application for patent in different countries. Apple is considering a special version of the upcoming iPhone with dual sim in the feature.
In US the patent has even awarded to Apple. In china it is in pending.
A dual sim card option may add some bulk to the hardware of the phone. So as a solution the interest is growing for embedded sim(eSim) which can be reprogrammed through a software.
Instead of providing a carrier for a physical sim card to get network, the card can simply reprogrammed through a software to get different network.
Apple has already started shipping of eSIM for its iPad pro this year.
Apple is trying hard to ignite its growth in emerging countries like India, China and other. As the competition from the local brand has made it tough, Apple need to think out of the box. Because the popularity for dual sim phone is high in countries so if you don’t offer this, omeone else will come in between.