This rebuilding will go on until at least 2021 because Hank, Staal, Shatty and Smith will not come off the cap until then. Nor will the 2018, 2019 and 2020 draftees be ready.
Gorts just made the Rangers significantly worse, losing Hayes and Zuccarello and replacing them with Lemieux and Vinni. The team that wasn't even close to the playoffs just lost of their best 4 skaters, their second and third highest scorers. Who replaces them? Kravtsov will be an instant first liner? Doubt it. Chytil and Howden average over .8 ppg per game? Would be shocked.
Even with Kreider, the Rangers will be the 3-5 worst team in the NHL next year. Maybe the worst. Without him, almost assuredly bottom-3.
The Rangers have been the second-worst NHL team since the TDL. If anything, it will have a worse roster in March 2020 than in March 2019 as we ship away Kreider, Vesey, Fast and Names in their last year before they hit the UFA.
The 2020-21 roster will still be stripped of all above average talent in their prime years (24-30) except Zibanejad. That's likely another top-5, maybe top-3 draft pick.
By then, the fans will be going crazy, with even the majority of today's supporters for a full, real rebuild. I assume the Rangers will use some of that cap space freed by the departure of Hank, Staal, Shatty and Smith on a star UFA or even two. If our 2019 first rounders are still developing in 2 years and will be rookies only in 2021-22, no problem at all.