He well might win, if the superdelegates elect to abandon her and swing to him -- which they very well might, given his much stronger showing against Trump, her own terrible performance as a candidate, and her rapidly falling poll numbers.
Now, the superdelegates are chiefly loyal party organizers of just the sort who pulled the Nevada spectacle. Nevertheless, it's still two months to the DNC in Philly. If Clinton falls into a tie (or even below) Trump, and Sanders continues to show strong support, she'll be in a bad position to retain their loyalty.
So, no. This isn't sabotage. It's fair play for the prize.
Meanwhile, if it doesn't work, Trump has already moved to seize Sanders' line that the system is rigged. Every bit of rigging Clinton has to do to claw her way past the DNC is proof that Sanders was -- and, therefore, Trump is -- right about the state of American politics.
If I'm right that Sanders and Trump are aligned in the core logic of their campaigns, Trump could easily land a large part of the Sanders vote. Everybody is talking as if this were the usual left-v-right election. I think it is an 'America-First' v. Globalism election. The real driver is economics, but both Trump and Sanders play out the logic also in their foreign policy. Thus, the Trump campaign may seem like a more natural home for Sanders supporters than the Clinton campaign. Especially for the Sanders voters who are genuinely working class, the elitist, internationalist Clinton may seem like a symbol of everything they resent.
So if you don't want that, vote Sanders. Him getting past the DNC as the candidate is right now the #1 best shot for keeping Trump out of the White House -- just as it is the #1 best shot for keeping Clinton out of the White House.