Faithful Servant, personally I would advise you to not pay attention to the words of Joshua Harris. I do not believe them to be Biblical, and I believe his viewpoints can do much greater harm within the Christian community than they could help.
A person who does not date is not going to have a relationship, for all intensive purposes. Dating is about establishing the bond. Sure, one could become good friends without dating, but you're still going to need to date.
The main problem I have with Harris opinion is that in today's busy world, people of the opposite sex have little time to hang around one another without pursuing a dating relationship. The consequences of such are that one cannot adequately get to know the person, and in the end, the person will get tired of holding out that there will be a future relationship, and life will send you your separate ways, as it tends to do.
As far as marrying within college, I have no problem with it. The person has to decide, though, if he or she is willing to sacrafice their education for marriage. In some instances this can be a positive thing, for you're not guaranteed another love, and finishing school could dice a potential wonderful marriage. Secondly, college doesn't guarantee you anything in this day and time. They're becoming more of wasted time than they have ever been, as it has become so common to go to college, and as the number of graduates are at high numbers, that getting a college degree no longer sets you apart. Besides, doing well in college, or getting a degree is only one of the requirements and is not set in stone for employment. Sure, it helps, but I wouldn't advise placing school over a potential wonderful marriage. If you both can decide to wait out college and then get married, then that is okay. However, relationships are more important than school, in my opinion. You have to decide what you favor. Many people have placed all their efforts into college and doing well in life that they miss out on the good things about life: Prime dating and relationship years. I'd advise against that, as I fell for that hook, line, and sinker.
I suppose I'd say that if you're close to graduation, I'd finish school. However, I'd make sure that the both of you acknowledge that you'll finish. If one decides that they can't wait, I'd try to stay together, perhaps finish college as a married student. Sacraficing a potential mate is NOT worth a college education, in my opinion. I hope that I'm providing the best advice, as this is what I believe.