You say that but Olave and MT are the only really productive WRs we have drafted in many years. So I don't think he's as easy to replace as you think. Beyond that, we have many other holes to fill or positions to upgrade. We don't need to create another hole to fill in exchange for a low round draft pick that is unlikely to fill any hole.
That's especially true when we are keeping Carr for this year in an effort to be competitive. If that's the plan, you don't trade a young 1,000 yard WR just because you think he might get hurt in the future. Especially not if the offer is a 4th round pick or lower.