Bitcoin users don't call the shots; they have no say whatsoever. Bitcoin miners control the network. What matters for them is their return on mining in BTC, and the exchange rate to their local currency to pay their capital expenses and electricity bills.

If the miners think that they'll get more value out of the system by creating new coins forever, they'll make the change. They have to be careful not to destroy confidence in the system; this will be part of their value assessment.