With Samsung making the two OSes so closely resemble each other, some day it might be possible to quietly swap OSes in Samsung’s mainstream smartphone, just like it did with the Gear line. For the interface at least, the change-over seems like it would be pretty seamless.
I give Samsung credit, this is the smart way to transition to a new OS—make it seamless for the user. As noted in the article, apps remain the big problem. This is a nightmare for Google.