With progress like this Russia could take most of Donestk by end of year. Then they need to ask themselves what is next? Ukraine will not give up. Should they call it a day or keep going for Dniprotrovsk or Kherson? What if they still dont negotiate? They should have a end game ready.
The further they push west the harder to occupy a more disobedient population. On other hand things will get easier as Ukraine exert itself. This is another factor to consider due to limited manpower size of Russia. It could limit the amount of land they occupy.
Donbass is in fact one of the best places for defense, since there is hills and a lot of settlements.
Once you pass the Sloviansk-Kramatorsk line there is nothing but downhill plains until you reach the Dniepr and not much population to control. Also central Ukraine is not that pro-nationalist and is somewhat neutral we could say from election results.
Should Sloviansk-Kramatorsk line fall I would expect a quick run to the river and then probably focus on Kharkiv.
With all this religious, civil and economic problems, even Zelensky officials had to admit that there is a growing sentiment for negotiations, I wouldnt even rule out that some warlord pulls out a Kadyrov and seizes power inside ukraine in favour of Russia...
I think everything related to the ukranian moral and support will depend on the success or lack of this in the upcoming offensive, as many pointed out, the support for war is also going down and down in EU ...