You see, the max supply coded is 63 561 840 coins (ref: main.h). So far, the network has produced 62 683 254 coins (getinfo). Leaving only 878586 coins to mint. When the max supply will be reached, in about a month --> no more rewards from minting = miners leaving = no (or very slow) network = no transactions possible = dead coin. Unless, the miners wants to mint for nothing, which is possible. Should be interesting...
ppl staking worldwide should provide enough hashpower for the network, i believe