I see what you're saying now. I guess I'm sort of lucky because that kind of thing has never really bothered me. Like... what the Muppets are doing now doesn't take anything away from the original series, the original movies, or my beloved Muppetvision 3D. The fact that the Simpsons has gone well past its expiration date hasn't ruined my enjoyment of the better seasons from long ago (like seasons 3-8). And the new JJ Star Trek movies haven't changed my feelings about the original series, the Next Generation, or the original/TNG films.
The expanded universe of Star Wars was already filled with comics, novels, cartoon series (Droids and Ewoks), radio dramas, video games, and who knows what else. I didn't really pay a lot of attention to that stuff, but I can't imagine that any of it would ruin the original trilogy for me. If it becomes too much with the new films, why not just skip them? Or you could pretend they don't exist, like people do with the prequels
But I know that a lot of people feel the way you do. Many people seem to hate reboots, remakes, and sequels for movies that don't seem to "need" sequels, but I've never felt like over-saturation has ruined the way I feel about the classics and originals they were based on. I could just be weird that way.