AGK is still a great product and I will continue using it but probably won't publish anything to Google Play store. If you can get Studio at a reduced price it is well worth it although I would probably give Classic a miss now as it's future is very uncertain. At a guess I would say only the Studio Windows and Mac versions will be supported in the future.

TGC thinks no one wants to code anymore. I beg to differ. With their GameGuru and GameGuru Max they are aimed at first person shooter games and you can't do a D&D role playing game or a sports game with it to my knowledge. Not everyone likes first person shooters. I do like them, but my favorite genres are D&D roll playing and real-time strategy.

They need to keep supporting at least AppGameKit Studio

I don't see AppGameKit studio going away any time soon as it is too good of a product to bin. Maybe they should offer classic users the chance to upgrade to Studio for a very fair price.

I think there are a lot of classic users that already have studio but prefer to use classic instead, myself included!

Unfortunately AppGameKit classic is going to die (I am one who likes the IDE as it's uncluttered) I now use AppGameKit studio for my game.

As the OP knows C why not cobble together a engine using that at least it will be future proofed and always there

Tbh, if AppGameKit Classic isn't going to be updated anymore, it's not as if AppGameKit Studio is going to be updated with much new features either, so they are kind of in the same boat of 'deadness' AKA not much updates... Since TGC is going to shift focus to GameGuru. If the current state of AppGameKit works for your case, then I say buy it. They are pretty good even in their current state. But since you want mobiles (which needs deadline updates regularly), so yeah... hard to say. Hope TGC can reassure/confirm the future state of mobile updates.

Thanks, all, for your helpful comments. As I am looking to do non-hobbyist, mobile device app development, I am going to look elsewhere.