I saw this question on zerohedge today. The guy was looking at https://github.com/bitcoin/bitcoin/blob/master/src/main.h and saying it's possible that this constant is changed in the future. I think he meant the whole network would be forced to accept a supply change.

This made me raise some questions:
- what happens if somebody runs a node or a pool with this variable different and we're reaching said supply?
- what if there was consensus in the whole community to increase this value, could that be done?
- if it were done and was adopted by all upgraded nodes, would that affect the mining curve and make new bitcoins's probability of getting mined different than it is now?
- wouldn't that invalidate the previously mined bitcoins worth?

Just thinking and wondering if anybody has had thougths around this.
Thanks