no, because we should have it be nationwide, all at once.
Just because that is the logical conclusion to a nationwide trend as states front-load their primaries doesn't make it any better of an idea. Front-loading is a problem, and it needs to be fixed, not institutionalized. Are you truly not concerned that a nationwide primary will advantage only those candidates with the money and resources to compete on a national scale? Do we really want only billionaires and millionaires to compete for the nomination? Because that is exactly what this will lead to -the selling of the Democratic Party presidential nomination to the highest bidder.
If that is a problem, why not repeat the national primary several times?
So say, there is a national primary on February (worth 20% of delegates), one in March, one in April, one in May and one in June? That way you get small candidates getting momentum and what not.