I think the general idea is that if I actually had my respectful unaltered Blu-ray trilogy, I wouldn't even be here. In fact--and I've said this before--if it happened, I would likely close up my projects, pack up, and leave without even saying good bye. Complaining and waiting for something that won't happen, and hanging out with other people who are also complaining and waiting for something that won't happen, is something unique to the Star Wars community. I'd even say it's the foundation for most of that community. It's why there's enough of us here to talk about TFA at all. The reason there's no similar community trash-talking Paul McCartney's albums (I agree, BTW), is that good-quality recordings of the Beatles that people love are widely available, so there's no community of similarly frustrated Beatles fans to do it.
Again, I don't "know" TFA will be terrible. I think the odds aren't good, and that's not really the same thing at all. I'll wait for the reviews to come in, decide then whether to see it at all, and maybe I'll add it to my personal canon if I like it. But no, I'm not going to wait in line for it like I did for TPM.