You don't trade warriors. You adjust their roles, or you may tweak their minutes.
You don't trade them unless you're stupid or don't want to win...or you're receiving an Anthony Davis type of asset.
Even then... over the long run, you'll miss Smart.
No...Smart will not be missed if Danny gets Davis in a trade that includes Smart. Tatum won't be missed either.
The C's will have a team that looks like:
Starters: Davis, Horford, Hayward, Brown and Kyrie.
Bench: Baynes, Morris(resign him), Semi, maybe Timelord if he isn't moved in the Davis trade, maybe a rookie if we send just 2 1st rounders, a couple of vets on minimum contracts(Jared Dudley seems perfect. Vince Carter would be good too) and Wanamaker.
That team wins 60 games and is probably a world championship team next year barring injuries. If that happens, no one is going to be lamenting the loss of Smart. People said the same thing about Al Jefferson in 2007. By June 2008 Celtic Nation was like "Big Al who?".