Watch a future Sonic movie have Doctor Robotik return as...
Metal Sonic.
Hear me out. Assuming Jim Carrey fully retires (Despite saying if the script is good enough for future film he'll return).
We saw how Doctor Robotik supposedly perished when the giant robot crashed and that the government officals couldn't find his body considering him dead.
Hence a theory.
What if...What if before supposedly perishing, Robotik transferred his essence and conscience into a robotic being he built with his similar in appearance to the blue hero he swears to destroy?
That's right Metal Sonic!
It'd also be a pattern.
General Zod > Doomsday in Batman vs. Superman
King Ghidorah > Mechagodzilla in Godzilla vs. Kong
Doctor Robotik > Metal Sonic in future Sonic film or Sonic 3 with Sonic and Shadow facing against him.
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Batman, Superman, and Wonder Woman vs. Doomsday (General Zod)
Godzilla and Kong vs. Mechagodzilla (King Ghidorah)
Sonic and Shadow (And maybe Tails and Knuckles) vs. Metal Sonic (Doctor Robotik)
Definitely seeing a pattern here. It's all adding up now!