Question releted to _id field

hie, I have DOUBT about the "_id" field. I am using my collection name as a combination of three _id's and there is a limit of collection name is 120 bytes. currently, there is no issue. If _id length is gone increase in the future then it creates a problem to create a collection in MongoDB. So, my question is:- Is there any possibility of the changes in the length of the _id field in the future?