Angular gained a lot of popularity by being an earlier contender at the time it was released... React is on the rise now, and may overtake it... Angular2 is more like React and a departure from it's prior take.

Businesses move slowly, and new project uptakes on technology is usually 3-5 years after initial release... .Net was out int 2002, but it wasn't until close to 2005 that it really started getting popular... jQuery was 2006, and almost an exception, but still not really strong until 2009... 2009 started Node, but it didn't start to shine until 2012-2013... it takes a while.

As it stands, at this point Angular is out there and a lot of current jobs are using/require it... if you can't sell a better option (polymer, react, etc), then you're stuck with it.