In as much as my private key gives me full control of my funds and it grants me access to sign a transaction if it gets misplaced then I'm doom for life. What if there was an improvement on this maybe a way of recovering back ones private key if it gets misplaced even if it would take a proof of work alogrithm or even a more tudious process but having a chance to get back lost wallets in cases of carelessness or maybe hazardous damage since it's not advisable to store private keys online nor would it possible for everyone to memorize this combined alpha-numeric values of SHA256 alogrithm
The best and safest method to retrieve your keys back in the future is to back them up as soon as you open a new wallet, writing down your seed/private keys is not difficult, since you know that you will be responsible for your own security, it should be your first priority before locking bitcoin on its public key hash.
If I have the opportunity to develop bitcoin, I will ensure that transaction blocks are kept to a maximum of kilobytes (if possible) so that other nodes do not suffer from a lack of space to store all data. This will encourage everyone to become a Node.
I will also make sure the speed is increased so that the memory pool can accommodate more transactions and miners will make more money in revenue, more people will want to mine and that will improve the security of the network.