Messy how? How is far less post per thread more messy than what we currently have?
You wouldn't sift through 10,000+ post because ain't no one got the time for dat, but a post total that's only ever in the triple digits at most is quite skimmable and less intimidating to potential new posters.
This thread is always on the front page of Nintendo discussion, post-limit wouldn't change that, so it'd still be not at all difficult to find. Plus the last post of each thread will of course have a link to the new one. By settle down what do you mean, everyone just re-tagging before going back to regular discussion? I don't see what's confusing or messy about that. As for responding to locked threads, that's a non issue since you can A) wait till they post, B) respond to it anyway, they're likely to see it when they show up, and/or C) private message them.
What information? What gear shifting? What's with all these undefined terms! Really we just talk about whatever, that wouldn't change in the new thread. If we were discussing how awful Color Splash is as the post limit was reached, we can simply continue doing so in the next thread. A current tournament, (which again should have their own threads as that is what's actually messy, hosting them in a multi-topic megathread with a cluttered OP), can just be concluded first before the thread is locked. You're making it sound a lot more difficult and complicated than it actually is.
And you could help more by bettering the thread. Just because it works "well" does not mean it can't be improved.
What is there to consider? Doing something about a problem is better than doing nothing, that should be the end of it!
Again, I don't reall feel it's necessary to start a new post especially at the pace Nintendomination is moving. I still haven't switched from 10 posts per page and I can still read through all recent comments within 1-2 pages.
The best way is to ask if you can't find something, since posts over 2 weeks isn't really relavent in the thread anymore. If people won't bother to read through the last few pages of this thread, even if a thread as at rebooted and is at 500 or 1000, they still wouldn't bother through all of those
A lot of posts is a problem, but upon discussion, restarting the thread isn't a good way to fix this issue
Logging events that happen in this thread could be a way to go, where I can link the page number or comment which starts a discussion on how amazing the NES Mini is and if any other special event happens (like a table of contents or a glossary)