Credits will become redundant because of Facebook’s new virtual currency exchange done from within applications.
Facebook users that managed to gather credits should not be worried. Their credits will be automatically converted to their local currency. Facebook new strategy is to encourage developers to charge subscription fees rather than charge fixed payments from inside their application.
Will Facebook users invest money to support the new Facebook model? Beginning of July will just show us how popular will this model get and if it will pick up just after its launch.