Nope, I prefer the long slog. It does provide opportunities for the initially unknown to build support and it also for the overrated to stumble. It's an endurance test.
Seriously. If you only want to have machine candidates with tons of money, go for a one and done.
I personally would favor a one-and-done system. That said, the primary should probably in April. Plenty of time for retail campaigning, especially when you have people announcing in March the year before.
Retail campaigning is useless in states of above 5 mil, lets say. Especially if you have to cover 50 at once.
Underdogs would never, ever, EVER have the money necessary to mount a simultaneous 50 state campaign.
Frankly, I think every single state should go one at a time. No super tuesdays. no clusters. One. At. A. Time.