I actually think we are getting the vast majority of questions answered - or at least “heard” in the sense that the person gets a reaction which (hopefully) helps them move forward.
I just checked and of the 5.4K topics started since the beginning of this forum, only 380 have no answer. And roughly 1/5th of those (estimated from the first 50) are announcements, so no response is OK. This should probably also include posts that have a reply by the OP, but the reply is not a solution or something like “Hey, I figured it out, nevermind” - not sure how to search for those. Our all time non-response is therefore around 6% which is IMHO great.
For the last 30 days (including today) we have 193 topics, 16 unanswered for a non-response rate of 8% (excluding announcements, I also checked single user topics with more replies and found all of them were either announcements or included solution).
Looking at the long-unanswered topics from the last 30 days, they don’t seem to be crazy difficult to answer, so I guess they were just overlooked and then disappeared from the front page.
So my best guess is that with reasonable additional effort, the amount of questions where the asker gets no reaction could be kept very close to 0.