I can see what you are saying, but at the moment DLC for the PS3 can is paid for via Credit / Debit Card in Europe etc.
There is nothing to suggest that Sony will not continue to use this current system, as your provided link does not state anything about changing payment options.
Don't get me wrong, I would love pre-paid cards for Europe as it saves me the hassle of using family credit cards, but at the moment there is no proof that this will change.