When Obi-Wan says:
"When I first met your father, I was amazed at how strongly the Force was with him."
This amazement could of also indicated that he was amazed that someone so close in age harnessed this same, strange new ability that was also so new to him, still being a young padawan learner. Never had he met someone that he could identify with, him being around older, stuffy Jedi, father figures. FINALLY, someone close to his own age also has this same, unique abilty and aura about them. The same could be said about Anakin, both now have someone that they can identify with, something in common.
Maybe Qui-Gonn could of took them to a remote planet, sensing through The Force he may not be around much longer. It could of continued the adventures between the two of them, bonding them through experiences, leanring the ways of The Force together could of been another bonding experience, training with each other to become Jedi Knights, through the same frustrations Luke suffered through with Yoda on planet Dagoba, to sharing the joys of finally being able to over come those frustrations. As Yoda said, " Its energy surrounds us and binds us".
I don't know, I haven't gave it a whole lot of thought. It's not like I'm trying to 1-UP George Lucas, creating the best possible script where there wouldn't be a dry eye in the house because everyone was so moved by Anakin's and Obi-Wan relationship. No matter how many other ideas and suggestion we have, the prequels are what they are. As Shimraa always says, they're George Lucas' movies, universe, and story. That being said, this post was created from a fans/audience members perspective based on the films we were given.