Depends on the long term contract’s Dubois is seeking, but if the latter would be satisfied by Suzuki-like terms (+/- 7.5M AAV), that would actually be a serious incentive for the Habs to acquire Dubois before 2024, even at the expense of a package including FLA’s 2023 1st.
Notwithstanding the risk that Dubois explodes, such a « premature » move would indeed likely save around 2M AAV on his next deal, if only because the salary cap will likely be readjusted in 2024, once the pandemic provisions will have been fully repaid.
Obviously, the most opportune timeframe for a Dubois deal would however be later in 2023 (TDL or draft lottery), so that his eventual acquisition doesn’t impair the Habs rankings too favourably for next year and, more importantly, so that the Habs don’t find themselves in a weak position to imperatively have to shed salary (Dvorak and +/- 4M winger) make a Dubois deal work.
With Dubois’ trade value basically dropping to a 1-year rental for 2024 contenders [« A quality » prospect + (late) 1st] and the cap flexibility and assets fetched at TDL 2023, the Habs can indeed circle back on Dubois at some point before the 2023 draft and put forward a (slightly) better, mutually beneficial, proposal based on the Jets’ primary objective next offseason : either compete one last time with Scheifele/Hellebuyck, or blow it up and initiate a rebuild/retool.
In the end, having both Suzuki-Dubois locked long-term under 8M would not only set up a complementary « 1-2 punch » for the next decade, it would also strongly dictate the financial structure of the future core, since hardly any player will then be in a position to ask for more AAV than them, besides maybe (hopefully!) the Habs’ 2023 1st and an impactful top-RHD in a few years!