Didn't Hilary Clinton kind of more than imply she was entitled to the 2016 Democratic nomination? That basically destroyed any chance that Bernie Sanders had at taking the spot on the ballot.
You can't stop how a candidate feels. However, if a candidate does choose to push her or his candidacy? We the primary voters (whether we are or aren't members of the political party in question) shouldn't directly award this arrogant stance.
Thinking one is entitled isn't the same thing as making it happen because one believes its the only legitimate reason it should be so. This could be a good way to whittle down the booming population of Democratic candidates. If one is actively trying to prove they are entitled to the nomination? Yeah. They need to be culled out from the field.