Believe it or not we're not. I'm pretty sure the Star Wars fan base is. Their are those who only follow the original trilogy, those who only follow the original trilogy and the spin-off material, those who follow only the 6 movies, those who only follow the 6 movies and the animated movie and it's tv series, those who follow the entire franchise (which is so large it contradicts itself all the time), those who only like the video games, and those who only care about the "Old Republic" parts of it.
With Sonic we have only the SEGA Fans which divide into Classic and Modern, and the Freedom Fighter fans which divide into SatAM and Archie.
From what I've seen, the Star Wars fanbase isn't very divided at all, in part because everything is part of a single continuity, albeit one that sadly relies too heavily on retcons these days. There are people that simply ignore certain parts (I prefer to disregard TOR and TCW myself), but I never see or hear about anywhere near the level of infighting that the Sonic fanbase is known for. No shipping wars or factions anything like that.
I could be speaking from ignorance, of course. Despite being an enormous Star Wars fan for most of my life, I didn't frequent forums much until 2007. By then, most of the controversy surrounding the prequels had mellowed. Then again, the fact that things mellowed at all puts it ahead of the Sonic fandom.
With that said, the new films could very well shatter the Star Wars fanbase,
especially if they retcon the entire post-ROTJ EU.
Possibly the biggest factor fragmenting the Sonic fanbase is that everyone has a conception of what the "true" Sonic is, of how the series should be. Given that those conceptions are based off of varying continuities with no ties to one another, they can't be reconciled. Put four Sonic fans in a room together, and there's a good chance each will have a radically different perception of the series. That's going to cause conflict, in part because those different viewpoints make ours feel threatened.
Take Sonic the character. The one in AOSTH is nothing like the one in SatAM, who is nothing like the one in the Adventure games, and so on and so forth. By comparison, Luke Skywalker (and almost every other Star Wars character) is always clearly the same Luke Skywalker, whether he's a farm boy looking out at the binary sunset in A New Hope or a Jedi Grand Master carving through hundreds of Yuuzhan Vong warriors in the New Jedi Order novels.
