Surely decryption is possible...
....however someone would have to go through the data to identify which decypted data set is the same as the unencrypted data. So yes decryption is possible but will take a very very long time and then yet even more time for someone to identifying the unencrypted data.
So not impossible just very very very time consuming
I would be interested to know who is willing to pay billions for the technology though, perhaps the mobile storage companies given that the decrpyted set it likely to be larger than all the data used anywhere in computing to date