Also funny if you consider we have "Fachwerkhäuser" (Timber framing houses) here in Germany which are up to about 800 years old. I would be curious if this will hold true for concrete houses in 500-800 years.
That doesn't necessarily make building everything out of it good, but concrete can definitely last a long time.
Sure there are compositions that are in fact better, but are they used in common buildings? I think the answer is 'no,' since costs won't cut themselves.
Which means very heavy, and only designs that can use gravity to hold them together.
The Colosseum fell because people stole the lead rebar--not because of the concrete.