[TxBart]

If the concept to be crossed over into has sturdy legs, then it can sustain for a couple of Christmas Seasons. Starwars/Transformers works well because Transformers has legs that carries it across generations and genera (Disney Label, Sports label, etc..). The SW/TF crossovers will stay vibarant as long as the brand managers/designers don't start resting on their laurels.

Some had cited Lego and Galoob's Action Fleet. These are play systems that when conceived well from the begining, can withstand all manner of bad decisions about what properties get blended into the mix. Such a well conceived system of play could offer a company an opportunity to dust off some long forgotten properties to try out on a new generation. Action fleet could have sustained had Galoob not gone belly up and had they not rested that system's success on the shoulders of Star Wars.

Can you imagine a 1/48 scale Thunderhawk vs. a 1/48 scale Redlen vs. a 1/48 scale Rattler?