Altcoin discussion belongs in the altcoin discussion area.
I am not talking about alt coins, I think this should belong in bitcoin. If there are less addresses to track, there should be less blockcahin size.
each block does NOT contain details of every address ever used... each block simply shows transactions. so if i do not use my address for a week it will not appear in a weeks worth of blocks.
but if you are taking a 25 satoshi fee from me every time a block happens then my address would appear in every block. thus ADDING to the blocksize.
secondly all i read your idea as, is a way to get peoples private keys. why would we need you to maintaine our addresses. that is kind of like a bank. which makes me wonder do you understand the whole point of decentralised. do you understand the whole point of bitcoin, its code, its ethos etc.
thirdly, when the reward decreases every 4 years the value of each bitcoin becomes more valuable purely because miners will not want to sell their rewards for anything less then an amount that will cover their lifestyle and bills. (in theory) thus causing the bitcoin price rise to compensate amount of bitcoins on the market (supply&demand) so in 40 years 0.01btc would/could be worth alot.
lastly worrying about mining profits is something that is not a problem for decades. so tell the idea to your grandkids, as its not something worth implementing now