Ainge isn't going to take a catastrophic, boneheaded risk of dealing Tatum + more for AD just to see AD go to LA the following year. He's only saying that to drive up LAL's price if they do trade for him, and/or also so that the C's will at least have a chance to make an offer for him this summer.
Right now, the focus should be getting past this deadline with AD still on the Pelicans. That's it. That's all we can control right now in terms of Anthony Davis.
After that, it's fair game. Every team that's legitimately interested can make their offers and make their pitches by next June/July, including Irving, Ainge, Wyc, etc.
I trust Ainge in whatever he does going forward. Some things he just can't control, but he's still trying to do what is best for the team long term. He isn't perfect obviously, but when you see the other situations with the organizations and GMs/Front Offices (look at the Knicks), then we should feel blessed.
Ainge takes risks, but he won't take a huge one here. He'll have to truly be convinced he believes AD will stick around long term. I hope Kyrie can help in that regard too.