I do agree though. It does look pretty bleak with Sonic. Especially after his Maker left in 05.
But, all Sonic needs is a good team behind him. Like I stated earlier, "countless devs could do Sonic infinitely better than SEGA right now". Because SEGA is flat out not doing a good job. They're just recycling ideas from older games. By just following old formulas that has been established as profitable or functional. And topping that formula off by doing basic fan service. I feel anyone of the devs I listed below would have done a much better job.
Who knows, he might make a comeback under a new developer/publisher. Like Netflix's Voltron and She-Ra did.