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The bitter experience from arena-focused Tournaments shows that, while interesting, this idea is very time-consuming, lengthy, and possibly even "conflict-prone," as Qwerty rightly said, and I completely agree with him!
1) I don't have time for an arena-focused Tournament, to be honest, because I'm currently running two Heroes 1 Tournaments, a Heroes 3 map contest, followed by preparing a Heroes 3 Tournament (Best of the Best), and in addition to that, I'm also participating in many other Tournaments.
2) I'm confident that the quorum will be even larger than 10 people, but the HUGE amount of work involved in checking saves, distributing arenas, explaining to each participant what to do with them, and identifying the winners (professionally, and to avoid conflicting questions/answers from the participants) is significant. I am also convinced that only one organizer should run a Tournament of this kind, and that person should also make the final decision (to avoid disagreements between the organizers themselves), etc.
3) Verdict. If a Tournament of this kind is to be held, it should only be after the new year (during the holidays), when people will have time (both organizers and participants), and doing everything "in a rush" seems impractical.
P.S. To the participants: What's wrong with speed/skill/resource gathering Tournaments?
Sincerely, VDV_forever