Suppose, there is a question (a math problem). It is answered by User A. The answer is, basically, that there is no solution. The answer is upvoted. Then (after, say, a year) comes User B and posts an explicit solution. This answer also gets upvoted but less, because it had less time and the question had lost the momentum. The answer by User A remains the most upvoted, even though it is wrong.
Then comes User C, and edits the answer by User A, replacing it by the solution by User B (only the final result), completely removing the content by User A. The answer after that gets even more upvotes.
Should we somehow respond or mitigate such phenomenon? Or it is OK?