But your premise is flawed.
Trump is motivating the base and the Dem vote is hitting record lows.
Primary Turnout Means Nothing For The General Election | FiveThirtyEight
Primary turnout is not reflective on the general election.
Some are saying that there is also a motivation to keep him out, however it's obvious that the excitment he's generating outweighs the "not Trump" movement because he's been winning.
And yet he hovers at below 50 % support, within his own party...
Furthermore many Republicans will stop hyperventilating and coalesce around him when he wins.
To an extent, yes, but it is more complicated than that. Exciting the base means getting more people out to vote, and there is no evidence that Trump will get more conservatives and republicans out to vote in November, at least compared to those who won't bother because he is the candidate.
Furthermore Trump's appeal increases in "OPEN PRIMARY" states whereas Hillary did better in closed primary states and Sanders did better in Open Primary states. Trump and Bernie Crushed it in New Hampshire for example.
And we really do not know what exactly that means, but a reminder:
Primary Turnout Means Nothing For The General Election | FiveThirtyEight
Independents aren't going to go to Hillary.
Well, she will likely get more than Trump, as she is liked better than Trump by independents.
Trump will definitely attract some Bernie Sanders Supporters who are outraged that the Dem establishment blatantly engaged in conflict of interest to help Hillary.
That is spin.
Hillary's negatives are also through the roof too and combine that with the dissatisfaction with the establishment right now and Trump can and will win.
Correct, but not as through the roof as Trump's, and most democrats are happy to support her, something Trump cannot say about republicans.
But most importantly Many of Trumps positions are very moderate and he's not talking up the things that alienate moderates.
Well, no, actually his positions are not moderate. They are not conservative, they are not liberal, but they are not in any way moderate(in fact being somewhat extreme). Insane is not the same thing as moderate.
He's not talking up hyper religion or banning abortion or tax cuts for the 1%. And where Trump is strongest is where Hillary is particularly weak and vulnerable: Trade, handling our military affairs in the middle east, immigration.
So now that you have identified why the base is not terribly supportive of him, you have kinda ruined your own premise.
What you have done is spout a bunch of "but, what about this?", most of which is not true, and none of which actually address Trump's real weaknesses. Clinton has the worst favorability rating of all the candidates, except one. That is Trump. Most recent poll has a full 50 % of respondents saying they view him "very unfavorably".
https://d25d2506sfb94s.cloudfront.net/cumulus_uploads/document/fz4kxi611b/econToplines.pdf. Trump has limited support within the party. In fact, the party faithful are working desperately to nominate any one but Trump. Cruz, who is hated by his peers in the republican party, is seen as preferable to Trump. And this gets worse as you get outside of the republican party. Trump, on pretty much every single metric used to analyze electability, fairs poorly.