How would Bitcoins crypto change? Let's say, that 20 years ahead, Bitcoins crypto is not considered secure anymore. More precisely the key length is to short for it to be safe. Be it the HASH or private/public key. What would our options be?
Could we simply increase the keylength for the wallets and make it mandatory? Would that be a hard fork?
Or could we just use a soft fork and advise users to switch to a new more secure wallet?
This would be a hard fork, and a difficult one to develop at that.