I really hope 2016 is the year all/most OEMs produce two variations of their flagship device; one small around the 5" size screen area, and one large around the 5.5-5.9" area.
A lot of OEMs are or have been doing that already. Sony, Samsung, Apple, Google Nexus, HTC. It's time for everyone to do the same.
Imagine for 2016:
-Moto X and Moto XL
-HTC One MX (M10), and MXL (or M10 Plus)
-Samsung Galaxy S7 and S7 Edge (or S7 Plus)
-Sony Xperia Z6, Z6 Compact, Z6 Plus (or Premium)
-LG G5 and G5 Plus
-Apple iPhone 7 and 7 Plus, and maybe a 6C or 7C for the 4.7" lovers.
-Google Nexus 5P, 6P (yes, the 5" version needs to be built premium, too, in 2016).
That's how the roadmap should look. Same for the smaller OEMs like Huawei, OnePlus, etc.