I can't believe how childish developers are acting about the 2.0 release. It will be a huge improvement, it will require you to learn new things and you shouldn't be a developer if you can't accept learning new things. Your arguments are bad and you should feel bad:

• It's impossible to upgrade from 1.3? Don't then, 1.3 isn't some compiled piece of software from MS, it's open sourced on Github and will probably have plenty of forks. Those old directives aren't going anywhere either.
• Everything I learn in 1.5 years will be wasted? No it won't, you are learning the concepts that everyone else will have to adjust to once the switch is completed. You'll know the right questions to ask Stack Overflow/Google when you remember being able to do something in 1.3 and can't figure out the new way to do it. You'll be as caught up as everyone else when the time comes, and that's a huge timesaver in the long run.
• This is development suicide for Angular! It's development suicide to lock everything down to the way people are used to, to try to continue to push the directive definition object, to continue to use controllers after realizing they are just half baked directives, and continue to do everything the ES5 way.

ES6 is a huge departure from the way things were done in ES5, complain about that if you want to complain about anything. Angular is attempting to be the first framework out of the gate that embraces the new syntax and it's cleaning up it's act in the process. It's really commendable that they are warning us so far in advance that this shift is going have to take place.

edit: wording