AgentofCoin I like to have answers; I'm open and I like to understand; You all guys look so sure... ; I really like the bitcoin people, and let me say something as a joke: to succeed in life it is not enough to be stupid; you must also have good manners (Voltaire)
ill pretend your not a troll and instead just a noob.. so here goes
in 120 years the rewards would be insignificant.. so for 119 years relax its not your problem
in 120 years peoples mindsets would change from thousands of people mining for profit. to become a diverse range of hundreds of thousands or millions of people mining purely to secure their bitcoin.
the transaction fee at the moment is less than half a penny.. and over 120 years the transaction limits and usage of bitcoin will change soo much that these half pennies will add up to be a sufficient amount to cover basic electric costs of the devoted miners that only care about security..
infact these devoted miners may have such a substantial hoard of bitcoin that the electric usage just to secure the network is cheaper then trying to secure their fiat investments and thus the transaction fee's wont be something they require.
put it this way..
if i have 50,000 bitcoin id happily spend a couple bitcoin of my own savings on the electric just to secure my hoard and i would not ask anyone else to pay me tx fee's for any blocks my miner solves..
but as i said in my first statement.. your worry is about something that is MANY MANY years away, far past your lifetime and plenty of time to deal with, it's not going to be something that shocks the world over night anytime soon