So like
1: 100
2: 250
3: 500
4: 1000
5: 2500
6: 5000
7: 7500
8: 10000
9: 25000
10: 50000
and maybe even add more since there are now more eras than there was when the initial chart was made
11: 75000
12:100000
I dig this idea, since for me too it seems very easy to achieve the current thresholds of education...except for the one that comes by the end of the transhuman era (now at 25000, suggested to be set at 75000!
I reached there only in one game, first time that far, and not paying attention to my cities education level, not building all religious buildings, but all other significant ones that have to do with all properties, and also not using bards-entertainers-software devs etc. Up until there my cities easily reached 10000+ points, the education threshold required by the transhuman era.
But to reach the next threshold, I found this era to be lacking in education buildings (I didn't play in space maps, maybe this was partly the cause?). As I progressed a bit through the era, I tried to use developers to raise my cities' education, but to no avail. The population of these cities (50's, 60's, 70's) requires so many of them to reach the 25000 education limit, so I can't imagine how harder it'll be if there's no tinkering in the era's techs/buildings.
At my next game I had this in mind, and started to accumulate many religions from early on in my cities, as they are the only ones that give extra education apart from science/educational buildings (you can get 5-7 pts per religion/turn/city).
That sounds like the higher education is favored by religions, but what about the atheists then?
I'd like to hear about this from other players that reached that era or beyond, but I think the later eras need either significant boosts in education, or their education thresholds shouldn't be set that high.