Alex,
A big question not really related to this blog post. However there are several compelling reasons to continue developing Access apps. The first is there are many existing applications some of which are quite large and long lasting already developed using Access apps. To switch those over to PowerApps at this point would not be trivial. The second is that at least at this point PowerApps require Office 365. There are still many business that have not made that move and still deploy the perpetual versions of Office. The third is that although powerful right now, and more appropriate in some instances, to get deep into functionality that requires programming, PowerApps must be integrated with components like Azure functions as opposed to being contained all in one package like you can do with VBA in Access.
- Maria