Are you guys sure about Tizen? It's not exactly a winner in terms of security.
I am in full belief that the MAIN reason why Samsung is doing all these extra apps in Touchwiz that replicate Google services is to get them out there and then transfer them to Tizen.
Have you been in the Galaxy Apps Store lately? It's slowly filling up with apps that were in Play Store.
What I really like about Samsung is how patient and strategic they are, they are in this for the long haul. There will be a day where Tizen is ready to go global, for now Samsung are enjoying the spoils of Android while building their own ecosystem very quietly in front of us, lol.
DeX, Bixby etc.... There will come a day when these all run Tizen. At some point their TVs, Washing machines, Fridges, microwaves etc... Will have Tizen. It's just a matter of time.
Samsung are a company that is constantly ensuring they find a "fallback", remember how quick they were to adopt Android JUST as Symbian and Windows Mobile fell apart? Samsung had successful Symbian and WM phones in 2009, but as the hammer came down on both OSs they quickly launched Galaxy S in 2010 ready with their own fully fledged UI that they had developed on both Symbian and WM.
One day Tizen will get it's day to shine, but Id say don't hold your breathe, I don't see Tizen taking over before 2020, until then Samsung will rideout the Android Wave, and they will continue experimenting adding duplicate features etc... To what Google do, if the day comes before 2020 where Android becomes highly compromised, don't be shocked when they bring a flagship with Tizen that is complete with an Exynos SoC, ISOCELL Camera, Touchwiz interface witg Bixby, DeX, Galaxy App Store etc... built-in in pretty much ready for prime time.