But I heard something recently about the National League seriously considering the DH?
Heard the same thing. Came from an off the cuff statement by Manfred that NL owners were not as hard core against it as in the past. But owners asked about it did not confirm the topic is even on the table for discussion.
I personally do not like the DH. Forget the strategy angles. It has changed the game in other ways. Players who would not even have been on the field without it because they could not field worth a darn considered worthy of HOF. Need for a bench has almost disappeared on many AL teams. They have utility IFers but they are as much emergency place holders in case of in game injury. Call up from AAA replaces the injured player as often as not soon as a roster move can be made. Those bench roles more and more are being replaced with more relievers in the bullpen leading to more specialization and waves of fresh arms. In the long run that reduces offense. You can see the subtle signs in the roster moves just before an AL team goes to a NL city to bolster the bench.
Once the DH is adopted by the NL so teams no longer have to at least have contingency plans for a bench I believe bullpens will grow even more important.
When the DH first started I thought complete games would go up because now pitchers would no longer need to be pinch hit for. But it has had the opposite effect. Now with no more need to stretch and extra inning from a starter so a double switch need is eliminated starters actually get pulled faster.