The question has always been how to clean up (all of) the corruption, and have it stay clean.
If Trump cleaned it up, 'they' would regroup, corrupt whatever departments were necessary, and continue their corruption. It's easy for them to corrupt a department or two, as it is a (rather) small job.
But what if the people woke up? What if 'they' realized that 'the people' no longer believed the media? Is it possible to control an entire population when the spell is broken?
What if (nearly) the entire nation (or world) was aware of their evil, and was actively fighting back? Peacefully and lawfully, but actively.
And when/if 'they' continue their obstinate games, what if 'they' (figuratively) found themselves at the business ends of tens of millions of pitchforks?
'They' need to fear us, not Trump.
Yes, I know.
My point is that it is only the (figurative) pitchforks that they will fear. The fact that the people will (reluctantly) take the law into their own hands to remove the evil.
'They' don't fear law enforcement (they've corrupted them). They don't fear the courts (for the same reason).
And they certainly don't fear us (without the pitchforks). They don't even acknowledge us, other than to mock us.
I suspect that a 21st century version of the Wild West is coming back. There are large swaths of law enforcement that are not doing their jobs (or 'just following orders'). And if there is no (true) law enforcement, then the people will step in (in order to survive).