This would not be a good look for the NBA while so many people who are in the higher risk categories are waiting for vaccines and vaccinations are progressing so slowly.
You only need a handful of people getting the vaccine to promote awareness, which we already have with several celebrities including Kareem Abdul-Jabar who is a higher risk older person.
Have a few more older, retired players like Magic Johnson, Larry Bird, Charles Barkley and Michael Jordan get it. That's more than enough to promote awareness.
You don't need the entire NBA of young athletes in their prime skipping the line to promote awareness. If they do it, the NFL, MLB, NHL will all want to do the same.
The NBA started off setting the bar for covid response with the bubble and has been completely downhill ever since.