It might be a big risk specially for Lakers but I think in the long run it will be worth. Yes, the West has evolved again, we don't know the status of Golden State or even Houston next year, but Lakers definitely will be a contender.
That's risky but they know better, they would not agree with the trade if they believe AD will not make the Lakers a championship team.
Let's just watch next season, I do believe that was a wise move, although risky.