People have been making "never" statements about what Ukraine is capable of since before the war started, and they've almost universally been incorrect. You're also paying a lot of attention to the minutiae of Ukraine's pressure and ignoring what's going on in Russia politically, economically, and in terms of burning infrastructure.

As for this "going away" like it or not that doesn't work and it isn't going to happen no matter how much people would like to wish it away. Russia taking a break to re-arm and recover isn't the same as "it's over" and frankly that's why Ukraine is stuck fighting the way they are.

You're also missing the value that Western nations get from Ukraine fighting Russia, both in terms of disrupting Russia, and advancing the state of the art of drone warfare, EW, etc without the rest of us having to fight and die for it. The amount of money involved when considered against those factors and the economic reality of an EU-integrated Ukraine makes this entirely sustainable economically.