Hi all.
Maybe tomorrow, if I'm not too busy, I will have a detailed graph of what's going on, at least in the top-10 (or top-20) editions.
In the meantime, some basic spells on MySQL show this for eswiki: http://pastebin.com/m19859c24
Where perc_logged_revs shows % of bots edits over total number of logged users edits (by month) and perc_revs shows % of bots edits over total number of revs (by month, including annonymous users).
The magic of numbers is that they are (most of times) completely objective. Erik, your numbers seems to be fine, also looking at the monthly trends. Maybe my impression (and other past graphs) are only valid for enwiki, but I begin to have my doubts looking at these results. Tomorrow, we will see.
All the same, we all agree in that bots should be filtered out, but it was a curious question for me.
Best,
F.