Pawtucket Mayor Donald Grebien said Wednesday that the city is bracing for the impact of Hasbro’s decision to relocate its headquarters from Rhode Island to Boston next year, a move he described as disappointing, but not surprising. In an interview with The Public’s Radio’s Luis Hernandez, Grebien recalled finding out about the move only after employees had already been notified. “For the last 10, 15 years … the writing’s been on the wall.”Hasbro, founded in Rhode Island in 1923, has been headquartered in Pawtucket for decades. The decision will affect hundreds of Rhode Island employees, though it remains unclear how many will transfer to Massachusetts or be left behind. That’s what we have to balance.”Despite the frustration, Grebien said he hopes Hasbro will at least keep a footprint in Rhode Island and work with the city on a transition plan.