Sorry, but I think I should contradict.
For you it is "negligible" ?
Have you done the calculation ?
Alone with leaderboard-prices in one format and I counted only the three highest leagues Champion, Dimand and Gold their are 3,28 million DEC, means when also calculating the lower league and consider that this pool exist for both (modern and wild) format we reach propably 7 millione dec and this means by a season of 14 days 500k DEC a day, so if 500k DEC a day is negligible why you do a proposal to burn 500k DEC / day ?

To be honest I don't want do now the calculation for tournaments, also cause this is a question of exchange-rate between DEC and SPS, but I guess leaderboard price + tournamnet entries will have approximately the same effect than your proposal.