My ds who is now 4, never crawled. I heard many similar comments...I carried him too much, didn't give him enough floor time, and that I had to make him crawl. I still love that one... I too would like to see someone make a baby crawl. We had people tell us that he would be developmentally delayed, he wouldn't be able to read, he would be dyslexic if he didn't crawl.
At the time, I remember worrying about it a lot. I spent a lot of time with him on the floor, but if I put him on his belly, he just flipped over!
Anyway, so far he's fine! More than fine, in fact.
No developmental delays, though I guess its too soon to tell about the reading. Turns out there are a couple of others in my extended family who never crawled, with no ill effects.
My son's not really graceful, though neither am I, so it could be in the genes