Absolutely not, because Lebron wouldn't be enough for us to beat GSW.
Horford + IT isn't an upgrade over Irving and Love. If Lebron, playing some of his best basketball, isn't nearly enough with those guys, what good would he do us with a lesser cast around him? We'd get to the finals, and get steamrolled just like CLE is now.
And as someone mentioned above, few things in sports are better than watching your team build a contender. I believe we got the 1st big piece of that puzzle last year in JB, and we'll get another piece in 2 weeks. Could that strategy fail? Sure it could. But if we draft well, and Fultz is the player I believe him to be, we're a long way towards building a legit contender. OTOH, I don't think that Lebron, or George, or Butler, or Hayward makes us a contender. Adding one of those guys makes us a better team, but wouldn't be enough to beat the GSW juggernaut.
IMO, the only acquisition that would make us a true contender would be Kevin Durant. Not only is Durant among the best 2 or 3 players in the league, getting him also would severely weaken GSW. But failing that, I don't see a way to get to a title anytime soon. So I would preach patience, the draft, and youth.