BofA can no longer offer a Dividend Miles branded credit card, but can apparently still offer miles just as any other program affiliate (hotels, rental car companies, FTD, etc). I haven't ever heard of another FF program that allows a 2nd credit card provider to offer miles - usually the contract with a credit card provider gives that provider exclusive rights - so I don't know how long BofA will be able to grandfather current cardholders.
I know that if I were Barclay's/Juniper I wouldn't be too happy with a second card provider offering miles after I'd paid several hundred million dollars for the exclusive right to do so and prepurchased miles at least twice to help US through a rough financial period.
Jim