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Banks do have a lot of resources, but there is a problem with them taking ownership. If the bitcoin community saw that Banks were getting a big ownership stake people would drop it. Then the banks would likely absorb the loss since they bought high then it dropped. The whole sales point with bitcoin is that it is not bank controlled. Bitcoin has shown it can drop fast (example MT. GOX). In all likelyhood if they are going to go after Bitcoin it will be propaganda. They will openly associate it with crime attempt to make it illegal. If they get it to be illegal the first person they bust will likely be made example of. The price will go down significantly as some in the community would not want to go to jail. At that point it would be a underground payment system.