Does anyone know how many questions has Roomba deleted on this SE so far? I'm also curious how many questions are expected to be deleted in the coming months.
I checked all the deleted, non-closed questions from the period from 2014-02-14 through 2014-03-15 and found only one that has been deleted by the one-year rule (at least 365 days old, no answer, score of 0 (or 1 if the owner is deleted), at most 1 comment, and low views):
That's out of 45 questions posted in that time period and deleted but not closed. Most of them were deleted by the asker, a couple by moderators, a few (I didn't count) by the 30-day rule rule which deletes unanswered questions with a negative score (this rule has also deleted more recent questions).
As filtering these questions is tedious (moderators can search for deleted questions but there's no easy way to automate the filtering by deletion reason) I do not intend to maintain this list as time marches on.
You can find questions at risk of deletion on the Data Explorer. You need to look for them before they get deleted since deleted questions are removed from the Data Explorer (which is updated weekly). I'll let someone more fluent in SQL than me compose an appropriate query or someone better at searching SEDE post a link to an existing one.
As much as I dislike the automatic deletion of questions that aren't closed, we have far more pressing things to do on the site, such as answering the questions that people do care about as demonstrated through views and upvotes.