What are you even talking about? The Saturn suffered from a similar problem that the N64 did. Difficult to develop for so most of the decent games were 1st party. The Dreamcast was frigging amazing. The Game Gear, yeah, that kind of sucked.

Since Sonic Adventure 2 there hasn't been a good 3D Sonic game besides the new Sonic game for Wii. (I haven't played it, but I've heard it's good.) The Sonic Advance games were good and Sonic Rush is great. There's no need to "revive" Sonic since he's not dead.

As a 3rd party developer, they're doing fine thanks. Sonic games still sell, and they're responsible for hits like Shenmue and Phantasy Star.

There's really no problem here.