Yes, there's no perfect POS solution either, but they're still better than existing POW solutions.
But doesn't changing to POS mean inflation rate for bitcoin will be non-zero or am i missing something
Many will stand against inflation in bitcoin including me, bitcoin will loss its charm of being limited.
Inflation rate has nothing to do with POS.
Inflation rate in Bitcoin has always been non-zero, every 10 minutes new coins are issued - total monetary base is
inflated.
POS and POW both have advantages and disadvantages, I'd prefer to see a hybrid POW/POS solution to the current mess. However this is offtopic, this thread is about changing POW to another POW and how this is a completely broken idea.