You are aware of IPv6 aren't you? So, yes, a Protocol can also change.
That't the beauty about software: It can adapt to new problems and sometimes you have to make radical changes for that.
Taking that away from Bitcoin doesn't make a lot of sense.
Ahm.. Yeeess..
But thanks, you bring up a nice point that I shall now throw back at ya'..
How long has IPv6 been rolling out ? Years.. ?
Now imagine that you couldn't even use it unless 75% of the ENTIRE internet has upgraded to it..
Because that's how Bitcoin works, you can't just have some people upgrade, and use the new-teck, and wait for the others to follow suit. You have to wait until ALMOST ALL OF US have upgraded before you can even START using the new features..
I think 'decades' would be a closer approximation to how long the roll-out would take.. And then of course, you've got those of us who think IPv6 is, to be frank, bollox, and that they should have gone for IPv8 - (you know what I mean, 6 digits isn't enough, they should have gone for 8 and be done with it..)
BOOM!.. WAR!!.. (again..)
..
As for protocols that should have long since been superseded but just keep on ticking.. how about SMTP / POP3 ? Jesus, I bet their inventors never dreamed they would last this long.. But here they stand.
You can't STOP an attempted Hard Fork.. I know.. that's the beauty of it.. and if someone came up with the perfect system, anonymous, fast, global, etc etc, (..looking at you #GMAX..) of course they'll try to push it on Bitcoin, and good luck, but I think the GOAL should be NOT TO HARD FORK.
EVER.
But you are right, that it takes time to get that change pushed to every user and it doesn't get better the more users we have. That's why I just don't get, that "just wait, till we hit the wall, before doing anything about it"-attitude, a lot of people have. Bitcoin just isn't that nerdfest anymore, where all the user read the forums all the times. We are so lucky, that we know about this problem, long before it becomes a real problem.
I am pretty sure, there will be other problems in the future, where we will not be that lucky.