At this point in 1980, Carter had a 6% lead, with John Anderson polling at 21%. It was nothing like the margins we are seeing today. This fall is going to be a landslide for Clinton, and the end result of the Trump candidacy will be firm establishment control over the nominating process from now on. They will be able to say “we told you so”.
Unless you have an iron clad guarantee from the manufacturer of your Magic 8-Ball, the future has yet to be written.