The premise would be easier to buy into if it wasn't such a massive thing done by the government, since I can't picture any way that the actions described here wouldn't result in civil wars around the globe that could only end with the governments who did this being dissolved. If the initial time-lock happened after humanity was already colonizing space, then a rogue faction could have abducted colonists from a wide variety of places, or even colony ships which would be written off as the victim of disaster but with their actual fates unknown.
As the premise stands now, there would be too much dissent, including among those that the governments would be relying on to try and keep the peace. Short of having an army of literally brainwashed enforcers, they would be overthrown by everyone, including the very people they would be counting on to quell dissent.
As the premise stands now, there would be too much dissent, including among those that the governments would be relying on to try and keep the peace. Short of having an army of literally brainwashed enforcers, they would be overthrown by everyone, including the very people they would be counting on to quell dissent.