Speaking from experience, in CE the row 1 seat assignments selected when gold tend to stick. Row 1 in F always drop out. Therefore for CE for next year I'd say you'll be fine. Just don't move your seats out and then try to get back in to row 1 afterwards. Or if your flight is cancelled and rebooked having soft landed to Silver, you won't be able to select row 1 until approx 72hrs before departure.