Angular 1.x is here to stay for the next 3 years, at least. Here's why:
Originally Google said they would support AngularJS 1.x for approx. one year after the late-2015 release
of 2.0. (so for the entire 2016), and they received a harsh reaction from the community.
Then, they changed their tune, saying that they will support version 1 as long as there is a high demand.
This demand will be measured somehow by how well the community adopts version 2 as opposed to 1.
(let's assume another year of updates, 2017)
When it comes to job posts AngularJS is still HUGE from what I've seen, which shows that companies are still investing
heavily in 1.x. for new projects.
So, let's say Google will abandon the project for 2018. AngularJS is still open source (not like Windows XP), so there's an opportunity for others
to pick up development from where Google left off.
Even for version 1.4, Google states that:
"This Angular version is the first to be run by a much broader
community oriented team, including many people from outside of the
Google Angular team..."
(http://angularjs.blogspot.com/2015/05/angular-140-jaracimrman-existence.html)
This shows that Google is slowly releasing the project into the hands of the community.
There are many open source projects out there that are doing fine without Google's support. So will Angular 1.x.
By the time 3 years have past, version 2.x will be more stable and the migration path will be proven and tested.
If this sounds scary, you can just pick another framework, but chances are the same problems will arise.
It's a fast-paced front-end world.
