Bitcoin mining verifies transactions on the block chain. Eventually people might stop doing this once the mining reward becomes too small or once mining is over 100+ years from now.
Would advanced mining (quantum) solve this making only a few miners necessary to verify transactions?
What are your thoughts?
Assuming bitcoin survives that long, the ining of new coins will be replaced by transaction fees. The miners can choose whatever transactions they want to add to the block, so they may choose to not add any transactions where the fee is less than 1% of the amount transferred or whatever.
There will never be a time where "only a few miners" are necessary - then "a few" other miners could do a doublespend (51% attack). This is why so much hashpower is needed - now to do a 51% attack you would have to obtain 23PH/s (in case you manage to convince existing miners to help you) or 45PH/s (in case you have to buy new equipment).