"I can't expect" is a perfectly valid and usable sentence in written English. For example, "I can't expect to get an A on this test without studying.".
But I can't expect any one person to do that".
"I can't expect people to buy monsters," Mr. Hayek said.
I can't expect that yet, but I'm hoping for it".
But I can't expect them to catch on.
"I can't expect you, or anyone else, to believe this at the present stage.
I can't expect each of them to be some kind of heroic person.
I answer every letter in twenty-four hours, but, of course, I can't expect other people . .
Thanks to Ludwig my first paper got accepted! The editor wrote me that my manuscript was well-written
Listya Utami K.
PhD Student in Biology, Bandung Institute of Technology, Indonesia