I wouldn't hold back a kid just for sports or because maybe they will get a scholarship many years down the line. That puts a lot of pressure on the kids to stay in this particular sport. Children change and grow and they become interested in other things. I would do what is best for your child NOW.

Also keep in mind that in swimming as other sports age does matter a lot when you 10. But age matters less as you age and by 16-18 it's stops mattering as much. Until H.S. you daughter will swim against age peers. This will only be an issue when she hits high school.