There are currently 10,135 questions tagged with feature-request.
Of those, 7,882 of them have not been marked completed, declined, or otherwise.
Just to give you some perspective, there are lots of feature requests. They tend to gravitate towards the ones that are very popular (or very unpopular) and actually make sense to them when it comes to investing their time.
Another thing to keep in mind (don't know if this actually relates to you): don't mark accepted answers on your meta posts if it hasn't actually been resolved yet. The answer may be good and represent a valid way of achieving something, but if you still expect the feature to actually get implemented, you shouldn't mark the question itself as "answered." That makes it look like you've accepted an alternative and the feature you requested is not necessary.