My thoughts are that maybe the two of them should just let it play out however it plays out. Yes there are a lot of hurdles in a LDR but they both know what they are getting into going into it. Either it will work out or it won't. If we all avoided any relationship because there were circmstances that might make it not work out we would all live our lives alone.
Everything will be ok in the end. If it's not ok it's not the end.