It's quite plausible. Remember when Biden took office and essentially told everyone that he hadn't forgotten about what Putin did to the US (election interference and installing a puppet into the WH)? He said he would deal with Putin. And he's currently dealing with him. If anything Putin underestimated Biden's will in regards to him. Putin thought for sure that Biden would back down and let him get away with the invasion because surely he wouldn't put the economy of the US in jeopardy. Not realizing that Biden was willing to be a 1 term president and risk letting the economy go to hell to get him. And of course I'm sure Biden felt confident in his plan to get gas prices and everything else under control. But it was most definitely a gamble. And he was willing to take that gamble to take Putin up out the paint.
Once Russia got booted out of the SWIFT international banking system I knew it was a wrap for Putin. Biden sat everyone down and said "This is not a drill, we are doing this for real." For better or worse the U.S. economy can bleed out for fukking decades and keep chugging along like nothing from an outside perspective. Russia can't do that. They are nowhere near being a self sufficient nation that can manufacture all of the products needed for internal consumption let alone a sustained war against the combined military industrial might of NATO wielded by Ukraine. The only way this ends quickly is if it happens within Russia itself. Otherwise Biden is gonna let Putin drag this out to Russia's detriment for as long as possible.
Crimea by October.