Quoting jim_viebke, reply 69Wookiepedia has over a hundred thousand articles. If the entire EU is decanonized, the fallout will be interesting to say the least.
Edit: Or just call EU its own canon.
"I felt a great disturbance in the Force, as if millions of voices suddenly cried out in terror and were suddenly silenced. I fear something terrible has happened. "
A decision to decanonize the entire EU will compeltely fracture the fanbase. 10% will lemmingly attach themselves to the new continuity. 20% will begrudenly watch the new films and complain every step of the way. The remaining 70% will speak with there pocketbooks.
Well its hard to say about the entire EU, but basically they just wrote themselves a blank check to ignore whatever they don't like about the EU and are likely changing all the events that happened after Episode 6. Given that the Clone Wars TV series is still canon however means the EU elements it incorporated are still canon, and I would expect specific planets, ships and characters who where alive before Endor might still exist in this different Star Wars history. I wouldn't be surprised at all to see Thrawn show up in their new Rebels TV show eventually, even though the events of the Thrawn Trilogy are no longer canon.
For me, even elements out of the newly released material, even Clone Wars, yes even the prequel trilogy, I find to not be consistent with previously released canon material. (EU is canon )
The one that irritates me to know end is Chewbacca knowing Yoda before the empire was formed. Simply revealing that completely disassembles the entire reason of 4,5,6. Chewbacca could have explained the ENTIRE situation to Luke from the get-go and saved themselves alot of time. Luke could have went straight to Dagobah....actually had time to COMPLETE his training and THEN kick the emperor's butt. Entirely new timeline from one single ill-thought-through idea for franchising purposes only.
Fate is in Abrams hands. Hopefully he has more respect and consideration and I'll underline RESPECT for the fanbase when it comes to the Star Wars franchise compared to his brutal and savage butchery of the Star Trek franchise. There are laws against the slaughter of innocence...