I'm not totally against it, but maybe it would be a bit harsh to try to find out the worst of the worst (which is what we will do when trying to find the best of the worst) . I have considered it though so I'll wait to see if anyone has strong opinions either way on the matter.
Edit: actually on further reflection, yeah it sounds like a good idea. If it's 24 nations, the 8 who are eliminated could enter a consolation bracket to find the winner via knock-out. No need to find the worst that way
About your second thought, well I already brought up that issue earlier on this thread as that issue occured to me. The only fair way to prevent it would be to have everyone vote in advance of the contest but that was ruled out. And I am fine with that. I strongly believe that everyone or indeed the vast majority of people will vote for the songs they like the most, regardless of seeding or how it impacts the draw.
I'm not sure anyway that there will be seeds after the group stage. It will follow a simple format like Group A winner vs 2nd place in Group B. Or maybe Group A winner vs 3rd place in Group B. It will depend on the format. But it won't be possible to seed them especially if we are using simple format like 3 points for win, 1 point for draw and if each match has different number of judges who completed their votes.
I have no idea how the competition will go in honesty, it's very difficult to plan out in advance especially when we have to chase up votes from users as we go. So from an organisation perspective, it's probably going to be far from a neat process. But I'm sure it will be fun nonetheless.