It doesn’t really mean anything, but anything that’ll shut up the Bernie Bros is a good thing. I’m hoping the next move is to strongly encourage states to eliminate caucuses, which allow bullying activists for fringe candidates to have too much influence. And, I think a lot of Republican states might go along with ending caucuses since they can still remember the nuttiness of the Ron Paul people and how they were able to hijack control of a couple of state parties.
As long as all Democratic primaries and caucuses continue to allocate delegates proportionally, there’s little risk of the Democrats nominating a Trump. Trump was able to steam roll his delegate count by winning small pluralities in states with winner take all and winner take most delegate allocation.