As already posted, the grinder isn't supposed to be fun. It's supposed to be brutal and harsh and straight to the point.
Keep in mind that the grinder in Hawaii had significantly fewer players than a grinder in ANY mainland location will have. How many people were in the grinder in San Diego last time around? Enough that the Masters were chopped in half and STILL played 7 or 8 rounds. That's a LOT of people who are going to wind up "wasting" their time in a swiss tournament. In single elim, you know right away if you get to move on or not. And if not, you know right away when the dream is dead and then you can go do sides/party on the beach/etc.
The biggest problem from an operating standpoint with the grinder being swiss is that you get VERY few drops. What you get are gobs of no shows. Which screws around with lots of people's opponent win percentage. How would you like it if you were told that the Top 8 are getting in, and you finished 9th on Opp. Win %, solely due to somebody no showing a round earlier in the day, causing an extra loss that shouldn't be there? Single elimination 100% does away with all forms of tiebreakers - there won't be any "I would have gotten in if the computer hadn't given me such a crappy set of opponents." Now everything is in the hands of the players. Win, you advance. None of this win, you might maybe advance if you played a stronger field than somebody else who you never played did perhaps just maybe. (Yes, I realize there's still the computer determining who you play, but now you aren't fated to be doomed before you even start.)
Also, double elimination would be sorta problematic. Double elim is a FANTASTIC format for determining a single winner where the rest of the field's placing is irrelevant. But as soon as you need to start determining a Top X set of participants, it becomes a little more dicey, since you have multiple people being eliminated at the same time with no good way to determine who ought to place higher than the other.
I like it. At the very least, it'll be a good gauge to see if this is something that should be repeated in future years. No way to tell until you give it a shot. I'm just curious as to round lengths, since that wasn't mentioned.