Warning: This is an extremely scalding take partially written in satire and partially written in urine-soaked bedsheets as I frantically move the goalposts as each new poll comes in.
If Hillary Clinton wins in 2016, the Supreme Court will most likely, finally favor the democrats for the first time in a while. But if the economy slips into recession, then the Democrats could feasibly lose 12 Senate seats and more than 50 house seats. But if Trump wins, the democrats could actually make gains in the house, and possibly retain or stem the inevitable bleeding of the 2018 senate map.
I've thought about this, and to a degree you have a point (though I think your House seat gains are too high), but there are a lot of IF's in this theory. There is no guarantee we get an anti-Trump wave that is actually worth giving up the Supreme Court for. As IceSpear said, the Senate map in 2018 is unlikely to give us much, even in a wave. But, by 2020, we'd probably win Congress and end up with the White House for another 8 years if we pick the right candidate. Again, another IF.
Further, all this partisan politics ignores the huge danger in letting Trump have so much power and influence. Trump would be an epic foreign relations disaster and a couple years of him could lead to severe issues between our allies. Imagine what happens when Trump is berated for 4 years and, as usual, he feels the need to settle every little score? Except this time, he has the power of the executive branch. I'm not kidding when I say all that.
Having the next 4, maybe 8 years will allow us to finish remaking the federal judiciary from the top-down. Almost, if not every district & circuit court will be majority Democrat-appointees. With 8 more years, we have a real chance at a 6-3 SCOTUS majority.
In the end, by the time Republicans get the White House back, the oldest Millennials will be at or above middle age and the entire 18-50 age bracket will likely be majority-Democratic. After 8 years, any attempt to implement a broad conservative agenda at this time will likely result in a backlash as most of the electorate will be much too liberal-leaning for that. Even just buying us 4 more years will begin to put such a policy platform on shaky ground.
Would be better just to absorb the midterm blows, remake the federal judiciary and hold out until the electorate moves further left to where the conservative agenda is DOA.
And what if we don't win back the Senate (a distinct possibility) if and when Hillary is elected President? I suppose she could protect President Obama's legacy achievements (though Obamacare urgently needs some improvements....) and keep our foreign policy on an even keel, but precious little else.
