Wow this is crazy news to wake up to in the morning! I honestly believed we would get the 64bit update and then Adobe would just let Air limp along for a year or two before they dropped it.
I don't want to be negative but I'm a little apprehensive about jumping in to another companies walled garden but if the licensing price is reasonable for commercial work at least this could be a moot point, it could keep me away for personal projects though. If this keeps the ecosystem going with new desirable features, well thats just great.
I have to say though, without Starling and Feathers, Air is pretty much useless for me so I would 'Love' to see some investment from Harman in this area. I've started on a tentative path of Haxe/Flutter so we will see how this plays out.
Things are really up in the air now 😉