He did run as a Republican - a Republican with a populist bent. He didn't run as a neo-con - he torched neo-cons like Jeb Bush mercilessly.
Some might say that his populist pitch was a chapter out of the old-time D playbook. He appealed to the blue collar people in the "fly over country" - people who voted for Obama in 2008 and 2012, because they felt the Obama-led D party stopped representing their values. (And they don't - they look at them with disdain and HRC called them "deplorable, irredeemable".)
Ds still haven't come to terms with this. One of their historically-strong constituencies has turned their back on them, just like what happened in the south after the Carter administration. The Ds are now the party of the coastal elites. They are the party of identity politics. They are the party of temper tantrums and violent protesters. Their only message is to resist Trump and whine about every little thing he says or does.
They have no leadership anymore. OK, maybe Obama and Eric Holder from the shadows and backchannels, but no one that' obvious. It sure isn't Schumer and Pelosi.
Yeah, see, you and a few others seem to have declared the death of the Democratic party, and I just don't think that's the case. I think Republicans have a district advantage in the House to where they should usually have some kind of majority unless they just fall apart like in 2008. I think the Senate can be generally split because it falls more in line with the electoral college often (i.e. California will have two D Senators while Texas will have two R Senators for the foreseeable future).
I think the 16 election was all about the populist defeating the stuffed suit that no one trusted. I mean, I loathed Trump and would've probably voted for just about anyone other than Bernie or Hillary over him.
Literally, any of the other final 8 or so R candidates probably keeps my vote in 2016, except probably Cruz. Hillary didn't appeal to anyone but Democrats. Trump had the benefit of running against a candidate that most moderates hated,
and an effective populist bent.
I think it's a mistake - one that Democrats make often and one which led to their current predicament - to declare the other party dead because people have finally figured out that _________ party is the truth. That holds only so long as you have the popular candidate. And I'm not sure it's going to take an Obama wunderkind or a Trump firebrand to beat Trump in 2020. It may just take someone who speaks reasonably and can earn the trust of people. Trump isn't going to be new and shiny come 2020, and as long as Democrats don't put someone half-dead or completely whacky (or both in Bernie!), they've got a good shot IMO.
Of course, this all assumes that Trump's administration is ineffective, which it may or may not be. He's not off to a rip-roaring start, IMO. FWIW, I'm not dead set on voting against him in 2020. As I was after the election, I'm in "wait-and-see" mode. It could be that after all the bluster, he's pretty good. I'm just not seeing it yet.