Right on, RC!1. Is the game fun? If so, then play. If not, then do not play.
My game group has just started a campaign of Alternity in the Starship Warden (Metamorphosis Alpha) setting.
but we weren't playing MA
On the other hand, the idea of making a character for a sci-fi/space opera style game that starts (or transitions after an adventure or two) into a post-apoc game after some disaster befalls the ship/planet/whatever they are on does sound interesting, and I think a lot of the dramatic impact would be lost with forewarning.
As a PC Player what do you think of campaign or character starts that are different than you were lead to believe/understand/expect?
After considering it for a few minutes, I concluded that had it been me and my character, I would have told the GM I didn’t want to play that character.
Had you been the Player whose character’s “race” was drastically changed, would you have a problem with it? Or would you just roll with it?

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.