Regarding Gen 5 bans, it seems to me the bans haven't always been happening the same way. From the start, we banned the 670+ BST Pokemon and their ridiculous 150+ stats backed up by 90+ in everything else, capable of steamrolling teams on those stats alone. After Round 1, we banned Deoxys and Deoxys-A, both of which have 150+ in all three offensive stats, Darkrai, which was almost as ridiculous of a special attacker with actually passable defenses and Dark Void, Shaymin-S, which had its insane Serene Grace STABs and is to date the only Pokemon to be banned unanimously, and Moody, which was so insane it's been banned in Ubers. Today, I don't think anyone who really understands each of those bans would so much as question any of them.
After this, it stopped being so simple. A lot of people didn't like certain Pokemon in Drizzle, a lot of people didn't like Speed Boost Blaziken, a lot of people didn't like Sand Veil Garchomp, but I don't think there was ever so much consensus on any one particular issue, let alone how to handle it. A post some time ago in PR noted that as long as people have the option to change a metagame, they'll want to adjust it to be whatever they want it to be and not be happy with other options, that we should just pick something that works and run with it, letting people adapt themselves rather than making the metagame adapt to them. Their proposal to use the VGC tiers seemed a bit arbitrary, since it would result in banning important Pokemon for basically no reason, but the metagame as of the end of Round 1 seems much more viable for that. I mean, looking at the past few testing periods, we had people arguing Blaziken vs. no suspects, then Garchomp vs. no suspects, then Thundurus vs. no suspects. And if this round had run on time, Thundurus probably would've been banned, too. But when the metagame was left as is for a few months, with no option of bans, people stopped needing them. People have long since demanding Thundurus banned; they've stopped demanding anything banned. Does this mean we've really reached the right place in the metagame, the perfect "no suspects" stage? Maybe, maybe not. We don't know if this is any better than the other rounds would've been if they were left alone.
It seems like a worthwhile test - maybe as a separate server, maybe as a lasting Suspect tier on the Smogon server. Just take the metagame from the end of Round 1, with the BST 670+ Pokemon, Deoxys, Deoxys-A, Darkrai, Shaymin-S, and Moody banned, and maybe those additions to the Evasion Clause because no one likes Evasion, and just leave it like that for a few months or more, without any possibility of bans, and see what happens.