I understand at the moment burn is voluntary, but that's what hardforks are for.

Also, maybe I have a different version of STEEM but I see an option to take rewards as 100% Steempower or 50% SBD and 50% Steempower when I create a post. Am I wrong about this?

Why is it impossible to adjust the payout structure by adding @null as a non optional beneficiary on the next hardfork? In fact, there should also be the ability to increase the amount on top of the mandatory burn.

So Again, using 5% as a possible figure the rewards payout would be

95% to be split between author and curators and 5% to null upon post payout.

In regards to the SBD payout option , same thing as above but it will go to wherever it would need to go to get pegged (lol, this term makes me laugh).