Well I didn't make the petition, but it would dilute the supply which would benefit current owners of the coin and hurt future diggers. If you have 10k clams today, you will be staking 10x more clams. If you have 10k undug clams that you will discover and dig up next year, then your supply has not rising at all while the current owners now have more, meaning your value of clams should be less comparably.

This could have the effect of lowering the price of clams as there would be more supply, however stakeholders would have more clam so that should offset any losses in price. Also, the loss in value to future diggers would help offset some of the price/supply issues caused by the increased staking.