To be fair, that's simply because Disney stopped using him for stuff, along with Mickey and everybody else. He never showed up in Quack Pack (the last Donald-centric Duck show in the US) or House of Mouse, which means he wasn't a thing again until... what, the Disney Junior CGI Mickey show?
If this does well, Goof Troop is probably due a reboot as well. I KNOW there is already a Rescue Rangers revamp in the works.
You're right, there was a long period where Disney didn't have a regular show/cartoon featuring their signature characters (Mickey, Donald, et al) until they started airing
The Mickey Mouse Clubhouse in 2006. Probably shrewd on their behalf, aiming it at the youngest viewers and indoctrinating them early.
And it worked, because
Clubhouse still airs pretty frequently, with the addition of
Mickey and the Roadster Racers. (God help me) So if you're going to revive or reboot the spin-off series, it's a good way to get a new generation interested in the characters, a number of which are old enough for some more action/plot-intensive shows.