In this example the proposers wouldn’t care as long as they receive their selected bid minus the burn. If a majority of the attestors are fine with attesting to a block that burns at least 5 ETH, then it wouldn’t matter if another builder bids 6 ETH after the burn floor was set. Only if the proposer thinks that the 6 ETH came before the burn floor was set, he’d would need to also choose a bid that burns at least 6 ETH.
I think the main collusion problem is not setting the burn floow, which would be carried out by colluding builders. Though, this doesn’t get worse compared to the situation today where colluding builders could pressure down the mev boost payments and increase their own profit share as a group.
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