The Net is now just another way to meet people. In the future there won't be any stigma at all attached to couples who first met online.
to answer your question I believe the answer is NO. That is you specifically said if the real deal is possible prior to meeting in person. The basic premise I assume is that a person must actually KNOW someone before they can LOVE them.
I believe that you cannot really LOVE someone whom you have never met in person. Without the non-Net communication and interaction, your perspective is tinted and skewed, thus while I do believe a person can FEEL like they are truly in love (which is true of any fantasy attachment) I submit that it is NOT the real thing.
I further submit that even after meeting the "true love" one may feel is not really true until some period of time of experience with that person and may not even be many years of decades--this depends on the complexity of the individuals involved--and for some people they never fully know the other person. Most people are continuously learning and evolving (not in the evolutionary sense) all of their lives so it may be true that we never ever fully know someone else (or even ourselves?!) but I think some point is reached where we can comfortably believe that True Love exists and is based on an indepth knowledge of the other person.
NOw of course as some have pointed out on this thread, it IS possible to meet online and to marry and in fact I have personal experience in this as my fiancee and I met first online. But that really was not your question and obviously MARRIAGE does not equal TRUE LOVE, i.e the "real deal".
--Eduardo