I'm sure Putin is spending many a sleeplessness night pondering his long term fate.

The sanctions are not only having an economic isolating effect on Russia, as well, many powerful members of his circle have lost billions, and continue to bleed billions. Loyalty to Tsar Putin will only go so far. 
 
Despots have a way of being removed by internal factors such as people revolts, not so often by outside powers. Putin, being a student of history, knows this all too well.  Former Italian fascist Benito Mussolini was shot and strung up from a lamp post by an outraged mob. Romania's former president, Nicolae Ceausescu was taken out into a courtyard and shot by his own soldiers.

What will Putin's fate be once the Russian people realise he is a false prophet?
Will Putin face some future Russian court for treason, end up at the Hague, or take his own life as Adolph Hitler in some dingy underground bunker?

We live in interesting times.