I will say that if this team keeps Rakell going forward, I don't think they're as far off from being good again as their record suggests. But the issues are that:
1. The coach is well past his expiration date.
2. I don't truly know how good Letang is at this point. He can be anything from "legit #2/3 D having a bad season" to completely washed and it wouldn't surprise me.
3. Beyond Letang, the team has such a bad defensive group that it's going to take years to fix.
A big part of this is dependent on whether you can rely on Novak in more 2-way/defensive usage, but I think you have an interesting base at forward with something like:
Rakell-Crosby-Rust
XXXX-Malkin-Koivunen
McGroarty-Novak-Tomasino
You need a top tier play driver to play with Malkin on L2, but the rest at least looks intriguing. If you can get Marner, that's absolutely perfect. The defense? I would replace every single defenseman on this team with no hesitation, unless Letang isn't completely washed. For me to think this team can do anything before Crosby retires, you basically need to acquire at least half of a legitimate top pair this off-season and a full top pair by the start of the 2027-2028 season.