My fantasy post-Nevada proposal
Although this will sound a bit nuts, it would have considerable advantages.
Biden, Buttigieg, Klobuchar, and Bloomberg choose any game--Monopoly, Life, Go Fish, I really don't care which--they play once, 2 of 3, 3 of 5, again, I really don't care. Whoever wins becomes the center lane candidate. The rest drop out. (Having Warren stay in to divide the progressive lane is fine for as long she can last). Whoever comes in second gets first dibs at a cabinet spot if he/she wants it; whoever comes in third, gets second dibs, etc. (I suspect Bloomberg might be the only candidate who would want President or nothing.)
The VP choice is highly strategic and depends on who wins. Amy would be a great VP candidate for any of the men, but it also might make sense to go outside this group and consider others, e.g., Booker, Harris, Abrams, especially if Buttigieg wins as he has a serious concern about motivating African American voters to turn out. Regardless, these candidates coordinate, thereby combining forces behind whoever wins this game and consolidating the moderate lane.
Post-Nevada, I'm convinced that a game of chance is as good, and as bad, as any other means of avoiding the seriously self-defeating dynamics in the moderate lane, which threaten to have Sanders get the nomination and then lose the single most important election in this 59 year old's lifetime to Trump.
Comments are, of course, always welcome.