I am 100% against the destruction of coins. This creates way too many problems. You should be able to hold some for use whenever you want, without being forced to utilize them. This is part of what creates value.

I think what needs to be done is slow down the creation of new coins. We need some way to determine how many should be made and use that to continue on. Every month or so it should be re-evaluated and altered as necessary. This will help keep the total number of coins in check, without causing problems by taking away what people have already earned. Inflation (or deflation in the form of the currency's value) will handle that all on its own, and is a much more efficient determinant.