I think you run a great tournament and would personally love to see you keep running the nationals Mike.
Running something this size is a massive ball-ache and hard to do right, if anyone else should contact you and think they are up for the job then obviously you should think about giving them a crack at it or at least put it to the community.
With regards to Wyrd-Fest, it sounds like a great idea, the kind of thing I've wanted to go to for years and would love to see happen. However I would suggest being able to just partake in the Nationals only though as a choice as a 2 dayer is a big enough commitment for a lot of people. For me personally a 3-dayer throws up a whole host of problems which I'm sure it would for others too, time away from family, time off from work where an extra day is needed (it's hard enough to get the Saturday off for me) and obvious extra financial cost.