Lets see they still haven't done... God Ginrai version of Power commander Shattered Glass Commander Crystal Commander Lucky Draw Commander
well in theory they can use the molds until the break or become so worn that the quality is a fail, its more a question of how many times will they use it than how many times can they.
maybe you should edit the question to ask... How many times will TF collectors being idiots pay $80 plus a pop for a multiple reissues set of add on armor?
FP doesn't re-use molds, so they could basically keep making them until they run out of HasTak Voyager Primes to put them on.
They are pretty awesome. I'd buy more of them if Prime's didn't cost so damn much. I brought that Target Magnus/skywarp for 9 bucks.... sold Magnus for 20 bucks years ago... only if I would have known.
According to FansProject statement on mold use: They will not use the same paint scheme or design but keep the physical casing that holds the mold. It appears they they would keep the same shape but use different colors, so there is always a possibility of more versions.