A few weeks ago the weather (low ceilings) at my intended destination meant an alternate had to be on the flight plan. The briefer kept looking out farther and farther before finding one that met 91.169(c). The conundrum was that the closest airport that met the criteria may have been under a TFR (the President no less) at the time I would have needed it. Any FAR reason not to go ahead and use this as the filed alternate?