The people saying that there is no way in hell that the Donald could be elected president are the same ones who 6 months ago were saying that he would never become the Republican nominee.
The elections are 6 months away.....a lot of shit can happen till then.
This isn't actually correct. 6 months ago, it was Republicans denying the possibility of a successful Trump candidacy. Democrats then, and Democrats now, while revolted by pretty much everything Trump "stands" for (if that phrase even has meaning when applied to him), have long relished the idea of either a Trump or a Cruz nomination.
You are correct in saying that a lot can happen between now and then. But in 2012 the Repubkicans were consistently also denying the validity of poll after poll showing Romney, a much more palatable candidate to the general electorate than Trump, getting beaten handily by Obama. Remember, it is the Republican party that is the anti-science, anti-rationalism party, choosing to believe the earth is 6000 years old; that climate-change, if happening at all, isn't man-made; that homosexuality can be "cured;" that voter fraud is widespread and needs correcting via voter ID laws, etc. etc.
Clinton has her baggage - what public official with 20 years under intense scrutiny doesn't? - and you can believe what you want, but my money is on a catastrophic GOP loss.