The blackmail part is already illegal, so the criminals wont care one way or another. It's the victims that would now have two problems: damned if they pay, damned if they dont. It's not like the criminals will be at any increased risk or effort either. They're criminal operations already doing other criminal stuff, most of the work is automated (via viruses, bots, etc), and they already couldn't take the payments op…
If the size of the ransom stays the same, this provides a stronger incentive to keep IT security at a sensible level. Or, if this means criminals have to lower their demands to get paid, then the profitability goes down.
Use the money collected to fund IT security programs (research, awareness and assistance to companies in need of improving security.