It would also ruin the comic collector/speculator market, as that depends on the future scarcity of issues driven by degredation/loss of physical copies thus driving prices of those copies up in the aftersale market. Digital copies don't degrade.
But every single digital copy would need to be wiped off the face of the planet for the item to be and erased and forever gone, however. A digital product can be copied ad infinitum without any loss of integrity. As long as one digital copy exists, it can be reproduced. The issue would be proving ownership, which is something a technology like blockchain could solve - except blockchain relies on encryption and people are speculating when quantum computing comes on line, it will make encryption ineffective.
But that's a worry for a few more years to come...