The blogger takes it as a fact. I asked, if we take it as a fact, and I claimed I found the reasoning to do so compelling, I asked you to put yourself in that reality and say what the delegates should do, not what they should do according to your view of reality, not what they will likely do, but what would be best for the nation if the opinion of the blogger is correct. I am asking you to expand your view of the consequences at stake in this election.
Republicans smashed their party elites. Why didn't Democrats do the same and what will it cost us. Will there be enough rage pent up to put Trump in office? Will the folk partisan to Clinton take any responsibility if the Democrats lose? You probably know the answer to that last question.
Okay, I understand what you are asking now. If we assume the blogger is correct and that Hillary will lose if she is the candidate for the Democrats and she knows she will lose and she knows Sanders would win, then she should step down. However, that would be her choice alone. We would all be well within our rights to try to convince her to do the right thing, but it would be immoral for anyone to interfere or block her rightful nomination.
To extend this into complete absurdity to drive my point home, imagine there was a candidate whose only platform policy was that when elected he would have the military exterminate all US citizens and imagine that this candidate was actually getting enough support that it was likely that he was going to win. It would be immoral for us to try to change/game the system in any way to stop this from happening. It is every person's right to vote for whatever they think is in their best interests, even if they think extermination of the human race including themselves is in their best interests.
Getting back to reality, Republicans smashed their party elites because they deserved to be smashed. They have deserved that fate for a long time. Democrat elites are nowhere near the level of corruption that the whole party needs to be smashed. It's not even close.