The question quality will continue to decline as long as we continue to reward the bad questions with answers.
I'm willing to repeat an unpopular viewunpopular view here: We need to stop rewarding answers to bad questions if we want to stop bad questions.
Many bad questions on this site get good or mediocre answers from well-meaning (and/or repwhoring) users. The people asking the questions go away happy: they have their answers, even if their questions are closed or downvoted into oblivion.
To stop the bad behavior, we have to stop encouraging the bad behavior. We need to stop answering bad questions, and we need to downvote the answers to bad questions. The downvote tooltip says "This answer is not useful." Answers (even correct ones) are not useful if they contribute to the demise of the site.