I'm not sure BlackBerry developers are a good example. Some of the best engineers I know working in mobile got there because they worked for years on BlackBerry learning how professionals used their phones, how to optimize software for battery life, how to adapt company workflow to mobile, etc. Making the switch to the modern incarnation of the smartphone with touchscreens wasn't difficult.

It seems that outside a few safe areas (compilers, operating systems, etc) it's really hit or miss on whether your skills are adaptable to the evolving tech landscape.