Yes this idea is a good one. I think that it could be adopted and probably have an automatic portion that goes to the account for burnt steem just like we have an automatic portion of steem and sbd that goes to authors. But on the other hand I think it shd not be done collectively, I mean we should have a particular day for steem burn. Where everyone on the platform is expected to burn steem. By so doing we would have more people burn steem on a particular day.

Just a suggestion.

Thank you..