So not let down too much. Our team is also preparing to launch an mobile app which is expected to release second quarter of 2016. We just started to learn Ionic 1 a month ago, and really enjoyed it.
Know Ionic 1 and Ionic 2, you can at least learn why and how Angular and Ionic changes. This might give you great insight understanding this industry. Additionally, Angular and Ionic, personally think, does not have too much learning cost. (Especially for the Javascript programmers.) So do not worry too much!