You'd decrease the amount of money in general circulation, and therefore the amount available to everybody else.
In the classic boom/bust scenario, credit is expanded to unsustainable levels to counteract the effect of concentration of money in the hands of a few. When the bubble bursts, those who hoarded liquidity have even more economic and political power than before, because they have the money, and because credit has evaporated. The form of money doesn't matter- it could be gold, beads, or cowrie shells.
It's the way top down class warfare has been waged for hundreds of years.
Yes, it would cause slight deflation, slowly lowering prices over time.
Wouldn't do enough to cause any economic problems.
The "money" is not what people want, its the real resources in the economy that people want. Money is only an intermediary, decreasing the money supply does not change the real resources available.
If I had a printing press in my house, I would just print all the dollars I want and never work, I would be taking resources from the economy without giving anything. This also slowly erodes the value of everyones dollar holdings.
If I did the opposite, worked and just burned my salary, I am adding resources to the economy without taking anything in return, also slowly increasing the value of everyones dollar holdings.