The economic fallout is just beginning though
Hell I'd like to see 9% but I do think dropping under 30% would be a watershed moment as the congresscritters might start seriously worrying about their jobs at that point.
When costs for everything begin seriously rising (even more than they have) and houses fill up with 20+ yo kids who can't get jobs, and elders who's care is no longer subsidized, businesses are shuttered right and left, farmers go bankrupt, unemployment numbers spike while benefits are cut, higher education costs rise, and Obamacare subsidies are allowed to elapse raising the cost of health insurance? I can easily see another 10% peeling off.
And heaven forbid if there's another pandemic on his watch, or a Katrina-like disaster happens (but in a place where a lot more white people vs. black people die), and the response is massively bungled? Trump is gonna fucking OWN that, that'll cost him a bunch more points. And if the dollar and/or stock market massively crashes or gets replaced as the global currency? Whoa, nelly. We might legit see him impeached or 25A'd.
Which is why it's so important for him to criminalize dissent and crush the left's ability to organize and make voting more difficult. So, of course, fucking convicted felon and adjudicated rapist that he is, that's exactly what he's up to. 
