Hi Dezmen,
I don't know the size of your project, that does make (some) difference. You can slowly migrate your current project towards Angular 2. You can even run 1 and 2 in the same app. Look up ngForward, and ngUpgrade, both of those are supported by the core team! Using those (or one of those) you can gradually move your project to angular 2.
Anther option is indeed take this as an opportunity to a complete rewrite of your app, but it you probably need to support your old app, while building the new version. That is something you need to take into account.
Regards
Sander