And the Russians will just twiddle their thumbs in the meantime? I doubt it. There are enough rumors to suggest the Russians will reshuffle their military leadership again. That will likely be the prelude of yet another offensive. The Russians have massively expanded their weapons production. I doubt they will just be sitting down.
I don't know why you think that's not a serious possibility.
There are plenty of reasons to sit back and slowly grind for territory near Svatove-Kreminna. Russian strike capabilities are getting better every week and it would not surprise me if Russian leadership believes that time is working in their favor, especially in the medium-term as Russia learns more and more and brings additional capabilities to the front-line.
We also don't know what's going on in Ukrainian home-front. A significant chunk of their electric grid has been hit, supply lines, depots, and other critical nodes of their war-fighting system are being degraded pretty much daily for the last few weeks via strategic aviation and strategic forces.
Russia likely still has some sources of intelligence in Ukraine's institutions. For all we know, they may have strong evidence that the cumulative result of Russian strike efforts are bringing Ukraine's war effort to its knees. We also never got firm confirmation on what actually happened with Zaluzhny or Budanov. Maybe they were unharmed all along, but their prolonged and sudden disappearance is indicative of something, I don't know what, but I do believe that something must have happened.
I find it likely, perhaps even intelligent, that Russia will want to sit back, continue its operations in Svatove-Kreminna, and steadily destroy Ukraine's ability to fight from a distance.
I am also skeptical of analyst claims (like Kofman) that Russia undertook a "Winter Offensive" over the last year. I believe that a future major Russian offensive will have significant preparations and considerable manpower dedicated to it. To the extent that there will be visible signs and warnings before it begins.