If you think of Tucker's anti-Trump advocacy alone, you are probably right. Tucker is not enough of a political force to single-handedly drive Trump from office. But, if Trump does not die, stroke out, or go so completely bonkers that even his most-delusional supporters will have to admit that Trump is insane and must thus be impeached or removed under the 24th Amendment, there is a scenario in which Tucker might be instrumental in taking Trump down.
Democrats win House and Impeach Trump (expected)
Democrats win Senate (possible) and Impeachment trial begins.
A handful of Republican Senators will be needed to assemble the 2/3 vote needed to convict TrCarlson, his 5 million viewers, and a host of other influencers and voters lean heavy on those senators and the deed gets done.