I will not buy another high end phone unless it supports two SIM cards. I am getting tired of carrying my company phone and my private phone around (I know, first world problem) but I am sure I am not the only one who would like to combine two devices into one truly high end device. Give me an updated L1520 with dual SIM and I will happily throw my money at it.
Because Dual SIM is thing that gets sold only in developing nations, you cant get flagship specs on a dual sim phone. If you are willing to use android check out Xiaomi Mi Note or Mi Note Pro. Its a premium built device.