I wouldn't bet on them making the playoffs, but I don't think it's impossible. Here's the Pacific Division teams in 2020-21:
Just swap out Arizona for Seattle next year.
6 of the 8 teams had a below .500 record, which is insanely bad, especially in our current era where .500 isn't even very good anymore. I would bet on both Calgary and Vancouver improving, as well as Seattle being in playoff contention, so I'd probably slot them in 6th for next year, but it's not out of the realm of possibility for Calgary or Vancouver to continue to struggle, or Seattle not to be as good as some expect. I also think LA, while they have some old pieces, also have some strong young pieces in the likes of Vilardi, Kempe, and Petersen. Let's not forget that Doughty still isn't that old at just 31 years old (32 by next season).
So, in short, I wouldn't expect LA to be a playoff contender, but I also don't think it's wildly unlikely.