I think I'll throw how I'm going to view the canon from now on.
I absolutely love the post-RoTJ stuff and have always considered it gospel as far as canon goes (I mean come on, Legacy of The Force was ridiculously good). Same goes for the Old Republic era (Exar Kun, Revan, TOR etc)
Currently I'm having a "last hurrah" with the post-Jedi works; the games, the books, the comics, due to the fact that I prefer a single cohesive vision of the universe. This might not work for everyone but it's my way, and it works for me.
As far as the pre-RoTJ works go I'm going to wing it, consider everything canon until the new trilogy or new EU works conflict with those stories.
In the end I don't think it matters so much what other people consider canon, it's up to each individual fan to choose.
Hell there might be those who choose to ignore the new trilogy altogether and keep the Thrawn Trilogy, the Vong War, Caedus' downfall and the Legacy era as "their" canon.
For those complaining about the new trilogy mucking up the post-Jedi EU works I say unto thee:
Farfeik! What is wrong with you? For years we've all been clamouring for a sequel trilogy and now we've not only been granted that but we also have Hamil, Ford and fisher returning. This is beyond my wildest expectations.
To me the post-Jedi EU is played out, there's nowhere for it to go in its current state. The fact that after Fate of The Jedi there's nothing until 100+ years later compounds this fact. It's nice to have it all wiped clean and a new set of stories emerge. Will we ever see the likes of the Vong War and Legacy of The Force again? I hope so, but more than this I hope that the new stuff surpasses the old.
Sure I have a soft spot for the Caedus arc, but some sacrifices are necessary.
(Plus Adam Driver looks a helluva lot like a certain Sith lord to me, so there's a glimmer of hope.)
TL;DR: Don't get your panties in a bunch over this, enjoy what you want to. I'm sure the movies will be amazing.