I think Russia is going to lose this war of attrition with the west much sooner than the rest of the world loses resolve. Even Germany has earmarked funds out to 2027.
I think the political situation inside Russia won't allow for another mass conscription beyond the regular annual rotation. The initial waves of conscripts were mostly for the far east, not "true" Russians, so everyone is okay with it. Even the annual rotation is likely to cause a bit more unrest than usual as these guys will all know they're going to the front and not just on some training exercises. The troops Russia has in Ukraine are all they're going to get anytime soon. Russia's own budget has more money for internal security than the entire military so it's kind of telling where their priorities actually lie. I think they're concerned about repercussion of another large conscription wave both for the economy and unrest because why wouldn't they just call up more men sooner?
I don't think they have the production to keep it up, either in scale or the technical expertise. Brain drain since 2014 when sanctions first started and massive exodus of manpower during the first wave of conscription out of the country, and of course huge sanctions. Which even if they're able to circumvent, it's through much longer logistics networks that extend production times. They're just as unprepared for a long duration high intensity conflict as the west. The west diverted their production to consumer goods and Russia turned into a gas station with a coal mine. They have Soviet stockpiles and a rather ordinary amount of arms productions when compared to everyone else. That's why they're begging their neighbors for more military aid and leaning on their stockpiles while they try to reorganize production.