To provide some data and context, there have been approximately 17,000 Gladius Cases purchased from the Guild Store over a recent 15 day period. If players bought Blood and Power Stones with Dark Energy Crystals to cover the cards in all of these packs, that would result in roughly 17 million Dark Energy Crystals being burned.

This is deceiving, so here is some proper context.
Only 39 guilds currently have a level 6+ store and are able to purchase blood stones and from that only 5 of them have a level 8 store to purchase power stones.

They've earned a combined 503,704 merits over the last 3 brawls (15ish days). At 2,000 merits per Gladius pack, that's only enough to buy 251 packs.

They all have Guild Hall/Lodge level 7+ (except 1 who is level 6) so get minimum 5% shop discount.
In a best case scenario with all players buying enough blood stones to cover all packs that would only burn 178,837 DEC.

The 5 guilds able to purchase power stones earned a combined 105,808 merits, enough for 53 packs.
In a best case scenario with all players buying enough power stones to cover all packs that would only burn 37,762 DEC.

In total that is a max of 216,599 DEC that could be burnt purchasing stones, not even close to the 17 million claimed.

So all in all, this change would mean almost nothing for the vast majority of players and and will be burning a negligible amount for DEC (at least for the foreseeable future).

A proper change would have been to also adjusting the store levels needed for guilds to purchase stones.
Removing the spy glass and moving blood stones to store level 4 and power stones to level 6 would have had more impact.