Honestly, the Doctor probably would have been exiled off the planet. Public displays of power by an alien inhabitant are strictly forbidden as they tend to attract more trouble than protect from it. Therefore forcible exclusion is generally the policy.

[He doesn't hate the Doctor, though. He's got good intentions. But he'd still kick him off the planet if he started making a big show of himself.] The point generally is that alien defectors need to be kept safe from intergalactic conflict and the entire planet needs to be protected from invasion. To maintain our political affiliations it's generally a bad idea to have someone challenging the universe just for a good time.