As noted in another thread, I don't think a player consensus on individual cards in B&R is really possible. Even if we could get some sort of board of players or even take polls, the amount of sets WotC cranks out and the shifting meta as such makes keeping ahead of it impossible. I also doubt WotC would relinquish control.
Therefore, I think a static set of rules for the B&R list would be best. It should be a comprehensive list with the rules voted on through a centralized, widespread poll with perhaps a month's time to vote. Surely Facebook and Twitter, all linking to the one poll, could gather millions of votes and hit the majority of Vintage players.
I envision something like a list of example rules that can be collected and voted on via internet poll, perhaps annually. Much like WotC does regular B&R announcements, the community could do a "rules review" as new cards reveal certain game-breaking elements to be problematic. These rules should never be card specific and should never be revocable (if a rule ever should be revoked, it shouldn't be ratified in the first place). Consider it to be more like the U.S. Constitution of B&R rules - not like state laws that can change yearly.
Each post could suggest ONE rule and any rationale for it. The rules should be generic, not card-nerfing-specific, and have an overall positive effect on the constraints of the format. The rule should also identify if it is a BAN rule or a RESTRICT rule. I.E. manual dexterity cards are likely a BAN, whereas something like "non-permanent spells that allow you to draw and net more cards than the casting cost of the spell" would be a RESTRICT candidate (e.g. wheel effects, ancestral recall, etc.)
Given this last banning, an example of an overarching rule that isn't card (i.e. Lurrus) specific could be something like: "BAN: Cards can not allow any player to start with more than 7 cards in hand, either in actual hand size or through access to another zone."
The rationale could be: "outside of mulliganing, having one player begin the game with a larger hand size is just strictly unfair and it results in all players having to adopt that strategy or begin every round at a disadvantage."
This would not specifically nerf any one companion, but would get at the core issue that people felt it was problematic: starting with +1 card is just unfair. This would also stop WotC from making any similar card that would impact vintage on this angle. Keep in mind, other formats like Commander are unaffected by these rules/list.
Please add ONE suggested rule in a post and the rationale. Please begin the rule with the tag "BAN:" or "RESTRICT:". If you have several rule ideas, please make a separate post for each with its rationale. We can at some point do a TMD poll to see which are good candidates for a world-wide community poll for ratification. Then we could A) send the ratified list to WotC with the proposal, or B) maintain a community B&R list (on TMD) with the ratified rules and specific cards banned or restricted based as a result of those rules.
Hopefully this works - let's give it a shot.