I dunno what Bernie was expecting. I think of him as pragmatic, principled, strategic, and not naive. But, I was expecting pretty much what we have seen. The establishment snowflakes have accrued all the delegates they could get, and so have melted away. Finally, now Warren, who he begged, twice, to run in the 2016 cycle, has been told she's damaged him enough, and so, too, she melts away. Kicked, even, to the curb by Biden. Owtch!
The good news is, I hear the preponderance of the remaining primaries, with two-thirds of the delegates to be chosen, are closed to Republican meddling.
And Nate Silver, apparently, still sees Sanders beating Trump, while Biden falls.