Yeah this is something I have also thought about and was pleased to hear about the time increase to 7 days. At least thats a start. Hearing about people still reading your posts from way back in 2002 is very interesting and is a good example of how information/intelligent opinion is a valuable commodity. Like a work of art, it does not devalue over time. When a newbie to art looks at Rembrandt the experience to them is new.
I have a feeling that Steemit will take this into account in the future
Perhaps when someone looks at a blog some years after it was first published the author will get some kind of % - like a copyright fee or something or pay some steem to look at it- Something anyway
It is a very valid point you make though and I dont think anyone can argue against.
I wonder of the 24hr timescale was initially introduced as incentive for people to keep posting. But there is only so much a person can say in a day.
How some people can keep posting high content everyday is incredible to me. Once every couple of days is enough for me.