1.
https://www.nba.com/news/nba-and-nbpa-ratify-new-collective-bargaining-agreement
2. You're welcome to your opinion, of course.
But I would point to the facts that... (a) the NFL has virtually eliminated one of its historical constants to the overall game in the last 5-10 years (the kickoff), and that (b) they're apparently seriously considering incorporating the 4th-and-25 option (a fairly substantial evolution) as a remedy to the loss of the onside kick as a pragmatic option for teams...as evidence that the NFL has less aversion than other sports to change. And (c), of the three major sports, the NFL is the only one that, in any given season, can be counted on to tinker with its rules at all. So, no, I cannot agree at all that the NFL is conservative, given that context.
I would also suggest that the NFL and NBA face a common problem, and that intelligent people do not hesitate to recognize how they might borrow ideas from each other.
I would also suggest that you have the 2-point conversion today in the NFL mostly as a consequence that it was recognized how it added something good to the college game.
Good ideas are good ideas, and bad ideas are bad ideas.
The NFL has been trying a flurry of different ideas for years now within the current parameters. People clearly aren't satisfied. Just logically, time to reconsider the parameters. An Elam Ending approach is a good idea. Again, it could take a different specific form than laid out above, but the key elements are stout... it's a viable remedy.