Also point out to them that they will continue to have KYC/AML control if they do this, since colored coin issuers will have to by KYC/AML compliant when dealing with bank wires in/out.
Oh yes, they will love to see how 'Gavin' from some 'Bitcoin foundation' says
"..you will continue to have...control.."Fiat currencies are not going to die, they are the main vehicle for them to 'control' our society. Besides, they won't like/believe anyone saying Bitcoin will destroy the dollar. If they ever think that could happen, they will kill Bitcoin in 1 day.
Bitcoin simply fills some holes that fiat and current payment system are not able to fulfill. Not a threat at all to their money. It's simply another option, it will always be another option. Nobody will ever be forced to use bitcoins. If it gets big, that means it's reliable and has some value for their users.