There are things that Bernie addresses concerning the environment that I am interested in (although I don't buy the global warming hype), Trump doesn't even address those issues though the Republican platform does to some degree. I see Bernie and Trump both as progressives, but I see Trump more focused on the immediate need problems, as well as the long-term socioeconomic issues. To me, both platforms would have value just different ones. Both agree on healthcare reform (almost exactly actually), etc.
So, the question is does building the wall a sticking point for people? Like, such a big deal that they won't vote for him? Well, that's ridiculous, because people who live the border are behind it nearly regardless of their race or origin. I guess it's easy to be "against it" while you live in a posh white neighborhood or in the middle of Detroit, but it's silly -- people who live the border get it. They'd overwhelmingly vote for it, so what is everyone else's problem? For most in America, it doesn't even matter but it does for these folks.
http://www.esquire.com/news-politics/a44782/donald-trump-the-wall/
Bernie has destroyed himself, so I wouldn't vote for him at this point. He would be a weak and ineffectual President, and no nation in the world would think he would be an equal. I don't hate him, I love parts of his platform, but he dug his own hole. He lost the race for himself. I agree with his platform sans immigration, and I'm pretty much with Trump minus the wall. Could Bernie be a valuable asset such as a cabinet member or some office? Hell yes, but President? Nah, that ship has sailed.