Ya. all possibly true.The problem with polls this far out is that they're only good for spotting trends. This is April and the elections not till November. What should be at least mildly unsettling if you're a Hillary supporter is that the gap between Hillary and Trump as gotten smaller and not bigger.
If Trump starts to lower his unfavorables with minorities and woman, that's not going to bode well for OP's proposition that there's going to be a surge of #NeverTrump voters showing up for Hillary. Also, keep in mind that Trump hasn't really unloaded on Hillary yet. I can't imagine him not being effective, given his track record.
They may say to hell with it and wish a pox on both their houses lol. They'll stay home if that's the case.
But Trump needs to do some major back-walking ; and do you think the Democrats are gonna let him?
"rapists and mass deportations" are gonna be in every campaign commercial ( with a Berlin type wall in the background)...
Then you'll see Hillary handing out towels in the men's room to transgenders who really self identify.....
That's the Democratic campaign right there,and it works. Do you want to be great again or do you want to be diverse?