That would depend on what is causing suicidal thoughts. If they are brought on by some form of illness, condition or malfunction in the brain like a chemical imbalance then yes there will probably be more effective treatments in the future, and possibly a cure. However if suicidal ideation is a result of external factors then no, because the problem is not with the person who wants to die; you can't cure someone who isn't sick. In this case it would be those surrounding that person who have a problem of some sort.