You lost today, kid.....
Don't get us wrong, we love your passion. But there are so many accomplished film buffs and critics secretly using the Raven as a haven for anonymosity, that you good fill a beach on the south of Cannes with their towels.
The concept of Indy's son is not only a cheap trick to propel a plot, but it also diminishes the true nature of who Indy is.
One of the most important things you have to ask yourself, FAN, is are you a father? Now I know this seem simple, but go on, really ask yourself: what does being a father mean?In today's society being a father is a much forgotten concept. Even the noir of Indy addresses that fact. "Well what do you want to talk about?!" Indiana is a conscientious self made hero. If we look at his character realisticly, can we see such a man responsible for the life of another. COME ON. He can't even keep his women straight, or hold on to a single artifact.[just kidding]
On a more serious note; if you have even done any fiction (or non fiction) writing, you know that one of the most important aspects of writing is the concept of character. Things like motivation, personality, quirks, sentiment, history, love and a million of other words define a true character. Can you really see someone as careful and methodic as Indy not being aware of the nature of his....ahm, essence. Would Indy really be the type of person that A) would sleep with someone so uncaring as to not share the concept of pregnancy with him and B) allow himself the liberty of ignoring the consequences of ANY action. Hopefully, if you know Indy, you will say no.
I will go on to say (to the delight of Canyon and Ameera and countless others) tha I believe Indy is saving himself for the most appropriate time. Just because Marion fell in love doesn't mean they "did it." That is my opinion of course. I don't think anything is removed from his character if we see him as a virgin romancer.
Sorry for the digression.
FAN. You got heart, kid. But the concept of Indy's child, while sentimental, endearing and fluffy; would destroy an already complcated and complete character. We are not developing a sense of humor, you're not going deaf. It is just a weak idea and everyone in charge will ensure that it won't happen. I hope what I have said will be enough for you to understand, or that it will inspire someone to expand the idea to the point that you will be able to.