Any time you can give somebody a break, it may keep them around for a bit longer. I don't know if it would be a long-term solution to solve our shortage and I don't know how many it would keep around on a short-term basis, because I think once they hit that retirement age, they're probably working because they want to or they need to. If they need to, then maybe the tax credit will keep them around, but if they want to be here, they'll be here anyway.
Ultimately, any time you can keep some extra money in their pockets, it helps, but I don't think this would have a big effect on how many would stay around at this point.