Sorry for being slow af replying to this. These are my thoughts, which you are very much welcome to contest/ disagree with/ prove wrong.
- I've really cooled off using PokeBase votes for this. I think their variable value over time means it can be tricky to make fair, real-time estimations of how many votes a post should have to stay up. However, I think the first two or three votes are fairly consistent and could be used in a cut-off system. In short, I think the first dot you wrote is good (maybe with the time period extended to two months?) but I think sorting the tours should be left to the poll after that point.
- I'm not really feeling the hide + re-suggest system you mentioned toward the end. I think any suggestion that qualifies for the poll once should stay public for visibility/discussion, at least until it becomes clear that it'll never get selected. However, we should absolutely have a separate system that determines when/if each suggestion will reappear on the poll (which, per the above, doesn't involve PokeBase votes). I think the only suggestions that should be removed on a timer are the ones that don't qualify for the poll.
- What's the goal of only allowing a certain number of tournaments from a person at a time? If the concern is centred around people spamming really badly thought out ideas, rest assured that the new thread will have its own regulations for suggestion quality. If we do this then I think there should be an exemption for re-posts of ideas from the original thread (which I think we should encourage).
- It'd be smart to limit the number of ideas on the poll. I think five or six is a good number. Precisely what goes on the poll could perhaps be determined by a descending 'tier' system, where suggestions that don't poll well will drop a tier and get lower priority for future appearances in the poll. The details of such a system would need to be thought out... we could design it to mix brand-new suggestions with past suggestions that have polled well, and fill the gaps with others when we're low on new/popular suggestions. I think it's important that new suggestions appear on the poll quickly, so whatever system we have in place can find out if they're a realistic chance of getting selected.
- None of our ideas address the likely glut of qualifying suggestions we'll get for the first poll that goes live after the new thread is made. (We will definitely get more than five or six qualifiers.) I think the best solution is to just include all the qualifying suggestions, and for the first few polls, be more sparing with which ideas we hide/drop a tier/etc so everybody gets a fair shot. It might be ugly, but it's better than the old system and we're doing this for the long run anyway.
- I 100% agree Bo3 (or simply first to two) should be the going format. That might help with a hypothetical seeding system too, since match differential can break ties. 16-player would be an ideal standard, but I don't think we'll always get that many participants.
- If we do start a seeding system, I'd want there to a consistent system in place for determining the seeds too. I wouldn't want tour organisers making it up on the fly every time. Maybe create a points system based off the results of the last three tours? Still begs the question of how the brackets would be arranged.