Nobody really knows what will happen with Echeverri. But what we do know is that in general our record in terms of letting players go has been absolutely fine. With the exception of Palmer, who was a record fee for the academy, I can't think of any/many players who have ever developed into someone good enough to make stake a regular starting spot at City.
The scramble to get kids into the team is generally followed by a scramble to write them off as not good enough (Rico Lewis is the perfect example, and even Palmer when he was at City and started playing a few games).