The Rescue Rangers would need to show up again for that to be possible. I DO know we're getting a cross-over with Talespin later this season, with Kit and Molly as modern day versions of their perspective parental figures.
The Three Caballeros also already have an on-going series that's airing internationally and on Disney +, so they already made it.
My only thought about this is... what do we do with it? I feel like I'd want a Ducktales episode about going back in time and doing stuff with the Gummi Bears before I'd commit to a series.
The Darkwing Duck reboot article does not mention that it would be based on the Ducktales (2017) characters. In fact the production company Point Grey has nothing to do with Ducktales currently. If they are going to make a series it would seem more likely that they will make it their own. HOWEVER, there is nothing here that says that's it is a done deal. There is also a Ducktales podcast that has claimed they have a source very connected in Disney animation who says that this Variety story does not seem to match what he has heard.
Personally if they go ahead with a new Darkwing show I feel it should be a spinoff of the current Ducktales show.
But, just like The Three Caballeros series, the Darkwing Duck reboot doesn't HAVE to be part of the Ducktales (2017) universe. Neither would any other series greenlit, even if the characters made an appearance in Ducktales.
The last big news I heard was that Rescue Rangers was going to be a Disney+ exclusive movie: with CGI animals and live action humans. Which is exciting but even more terrifying considering it's basically going to be another G-Force movie but with Alvin and the Chipmunks. I'm sadly not very optimistic on that idea.
I think Gummi Bears would do absolutely just fine as it's own show. The original series was formulaic but it actually had a continuing story at times. I really wanted to know if they would ever meet up with the Great Gummies.