Lean yes. Holding the house and gaining multiple seats in the senate would be seen as a mandate for Biden and the Democratic Party’s agenda. It’s unlikely democrats would have another opportunity to abolish the filibuster on their own terms and pass DC/PR statehood within the next decade without a significant shift in party coalitions, accelerating the sense of urgency.
The fillibuster isn't getting abolished, because it's the only thing preventing Republicans from passing things like an enabling act, and Schumer knows it.
I’d hate to break if to you, but when McConnell is no longer majority/minority leader, it’s only a matter of time before senate republicans abolish the filibuster on their own terms. Republicans are much more willing to play hardball than Democrats. Schumer is aware of this and if he has a 52 seat majority, he doesn’t really have a choice because the pressure on him and other Senate democrats would enormous. With a 55/56 seat majority, democrats are unlikely to lose the senate in 2024 and therefore risk a nuclear option backfire.