I am talking about mining not the fees. Surly this isn't a good thing.
How will it go down so that when the block rewards are very low the fees will be sufficient for the mining cost?
The costs of mining are limited by the expected share of the block rewards. When the subsidy halves, unprofitable miners will drop out and the difficulty will fall, raising the revenue of the more efficient miners that remain.
Hi, i want to ask. Did bitcoin transaction fee ever change before? If yes, who is have authority to change it?
Few years ago when 1 BTC = $1, if tx fee still same compare to tx fee now, that fee was too little i think (in dollar terms)
There is no authority that sets the fee policy. Anyone can pay whatever fee they want and miners are free to include or exclude transactions as they see fit. However, most miners and clients have followed the fee policy set by the Bitcoin Core client.
The fee used to be much higher in BTC and has dropped as the value of a Bitcoin has risen.