Um, no, it's far too late for a sudden attack of competence to matter.They're definitely en route to defeat, but it isn't over until it's over. They could have a sudden attack of competence. It doesn't seem likely, but it's theoretically possible, and if Ukraine loses western support, they're in deep trouble.
Even if Russia could somehow train all it's new conscripts up to minimum NATO standards, Russia just straight up doesn't have the equipment or logistics anymore to successfully take Ukraine.