There should. But yh, just make it clear that the Q&A will be about things that are not related to the retcon. It will create a much more positive atmosphere.
And for some of those who are still bitter with the retcon or find it hard to accept, follow my example. I've decided to take a new route in life and give up gaming altogether. Maybe that's a bit extreme, but that's my personal approach.
Remember, you are agreeing to Riot's terms and agreements. If you cannot agree, then leave and stop playing. It's a much better way to deal with stuff than staying here and being angry all the time.
Of course, post tips and suggestions about how to make the forums more positive if you have any :)