Text on the email sometime can have a misleading tone. If it's not too much a hassle for you to help him pursue this opportunity, I would recommend to send him a one-line email, "Great! Call me at {your number} to discuss further at {some date time}." If he doesn't give you a call in timely manner at this point, your gut is probably right. If he does, you should be able to gauge his interest within a few minutes anyhow.
He may or may not end up becoming one of the great assets to your company in the future, so don't let the one-line reply bother you too much.