I disagree.
Trump is only a symptom of the issues- getting rid of him was the easy part, just enough people needed to vote him out. The systemic change required to fix the multifaceted problems that produced trumpism is where the real hard work starts.
Headed for disaster? The USA is steeped in disaster: integrity and legitimacy of elections are questioned by MILLIONS of people (which is the bedrock of a functioning democracy), the GOP are going to challenge the veracity of the election results today in each governing body, you have a literal civil war brewing, media and social media are fomenting hate on both sides that make the divisions in the USA so much greater than at anytime in history, the money poisoning politics, and so on... that is a lot... I think the hardest part is just on the horizon.
I appreciate your optimism, though.