I've never agreed with that line of thought. SW is finite.
The older-timer OT crowd certainly keeps things going, but they're old and getting old. More and more are leaving the game. Likewise, the PT crowd is no where near the same type of fanbase and I don't think (even as they get older) they will be able to support SW the way that the OT fans have.
Old school fans have nostaglia for action figures and play sets, so things like HT are great for them because it reminds them of the past. New school kids have grown up on cell phone games and reality tv, they probably don't care about action figures.
Seriously, look at eFX, GG, even SSC - alot of their stuff peg/shelf warms. It's not like SW is so hot that people have to scramble to buy things anymore. Very little of it sells out super-quick - that's a sign that the game is changing for SW. Like it or not the next few years are going to be dominated by Marvel, DC, and LOTR. SW will always be around, but take a look at most online or retail stores - SW isn't doing all that well.