Some questions are asked about concrete situation at a moment of time. For example What has trump accomplished in his first term?.
As long as situation changes, answers may fade out.
Maybe such "dynamic" questions should be handled some other way?
It worth noting that there's a post notice for these very questions:
This post relates to a rapidly changing event.
Only ♦ moderators can apply and remove these notices.
There are currently two questions on Politics Stack Exchange which have this notice:
You can find these with a SEDE query.
I would suggest placing a bounty on the question with outdated answers. There is even an option for this on the bounty dialog:
In the specific case linked in this question, the original suggested duplicate question was closed for being opinion-based, so a bounty couldn't be started in this situation. However, as the community decided that the original was opinion-based, it seems likely that the new question will attract the same sentiment.
I would also point out that the only answer to the new question at the time of writing is just an updated version of the user's older answer to the proposed duplicate, which seems to reinforce the appropriateness of placing a bounty to encourage answers to be updated.