Given your recent trip to the UK, you must admit that some expertise is required to put on a successful conference.
Oh sure - but that's the type of expertise you get by looking at a piece of paper detailing last year's TAM. With the UK, the problem was that the organizer believed that if he had all of these celebs there, tons of people would buy tickets and he would be able to pay 39 separate presenters their (sometimes rather high) fees. It didn't play out, though. He needed 900 tickets sold to pay everyone, and only 200 advance ones did sell.
Since there was no organization behind the con (like the JREF is behind TAM) there was nowhere else to pull money from.
Whoever takes over will have years and years of data illustrating the cost of TAM, including travel expenses for speakers, printing costs, venue costs, honorariums, etc. They can just say to South Point "give us the same setup as last year".
Ok, point taken. Expertise is the wrong word. Experience, then. You must know how much can go wrong in the planning phases. One time the con I was working for had a speaker demand that another speaker be disinvited, for example. Thrice we've had speakers bail at the last minute, most recently on the day she was scheduled to speak.
Just getting everyone on the same page was a massive chore, not to mention the sponsors. Thank god I've a day job.
Sure - don't get me wrong, there are lots of things that can blow up in one's face. The live MDC event is one of mine, and the first time I tried to include it on the TAM program was at 5.5 - not 6 (which is the first one where I actually did make it happen, if I'm remembering the numbers right). The guy at 5.5 just never showed. The entire time he said he was coming - even had a flight confirmation. I thought there was no way on earth he wasn't going to be there. And then he wasn't (thanks, James Dawson, I still remember your damn name).
I can't remember if my next attempt at live MDC was at DragonCon, or if me pulling off the real one was in the interim, but the person didn't show up for the DragonCon one, either.
In both the 5.5 case and the DragonCon case, we had a discussion about the MDC instead. And, for the DragonCon one, we brought along a full dowsing test setup for audience participation.
But this is easy stuff - you just speak to your workshop leaders and say "We'd like to also have you at the ready to participate in the general program". A very good percentage of even the audience at TAM is involved in some kind of formal critical thinking, so failing absolutely everything else, you could just point into the audience and say "Now let's hear from you!"
I can't imagine that whoever takes over running TAM is going to have zero experience in events. Keep in mind that just in the past few years the functional leader of the JREF changed from Randi to Jeff to Phil to DJ and nothing has burst into flames.