"let's expect" can be used in written English.
It is used to express anticipation or the expectation of something to occur. For example, "Let's expect a good turnout for the event this weekend."
That there would be opponents should be expected, but let's look at this for a minute.
Let's not expect the doctors to fix us!
But let's not expect the president to scold them.
However, let's not expect her to do anything substantial about raising literacy levels or improving our mental health.
And let's not expect direct revenue upticks from CarPlay; just a more pleasant iPhone experience in "selected" vehicles.
Good, hardworking, kindly, ambitious people with a little larceny here and there.... Let's not expect to take their money and make fools of them while doing it.
"Let's not expect a rosy picture on the accounts but again it is not as bad as people seem to portray it.
Let's not expect anything at all from him — he also has to handle the ministry of the economy and the industry after all.
Let's never expect human beings to act any differently.
Let's examine expected positron-Ps traps in NP-biased coarse-fine-grained composite assuming a homogeneous physical mixture of two different solid NP, e.g. A (25 40 nm as for As4S4 crystallites produced by milling from bulk precursors, see Table 1), and B (2.4 3.4 nm as for ZnS crystallites produced by milling from chemically synthesized precursors, see Table 1).
