What if the choir has no cantors? Can the readers read the psalms?
The Introduction to the Lectionary for Mass, paragraphs 19 to 22, makes it clear that the psalms are to be sung, either led by a cantor, or sung straight through by all. Again, it does not forbid a reader from proclaiming the verses, but makes it clear that this should only be done when the psalm can really not be sung. Even if a reader proclaims the verses, the assembly should sing the response. This is also stated in paragraph 61 of the General Instruction of the Roman Missal.
