Alright, this topic got off to a promising start... why do these frigging curse arguments always come up whenever Jusenkyo gets mentioned? ...Anyway, can we get back on topic now?
The question is: if Genma just starting out on his quest to make Ranma the world's greatest martial artist, and then receives all of the memories from his counterpart at the end of the series (anime or manga, you're choice), what do you think he is likely to do?
As I may have made clear, I think Genma would try and take advantage of these memories. He isn't particularly wise, but he's not actually stupid - if he knows ahead of time that, say, the Nekoken is really a joke of a move that only an utter idiot would teach, or that Jusenkyo is just asking for trouble in both Ranma's romantic life (I'm pretty sure Akane's made it clear she thinks Ranma is a freak for bending genders in front of Genma more than once) and with the contract, he's not going to pursue them.
And to try and keep this topic from getting derailed again: if you've got some belief that Ranma and co are "destined" to get their canonical curses if they ever vist Jusenkyo, I don't want to hear it, alright? I don't give a flying fig farm why you have that theory, and I couldn't possibly care any less about it than I already do. If you have a genuine reason as to why Genma would, knowing what Jusenkyo does, still head there, then that's fine; that's on topic. Arguments that it doesn't matter when, where, how or why Ranma or whoever enters Jusenkyo, they're still going to get their canonical curse, those are not on topic, I don't want to waste time squabbling on them, alright? Just keep 'em to yerself. You can believe that's what would happen if you want, but it's not relevant to this topic - this is a thought exercise on what Genma would do in general with foreknowledge, not a debate on how/why everyone absolutely has to get the same curses no matter what.
Water, water, everywhere, and all was cursed and black!
Drowned ones cast bad spell and out come pig, girl, duck, panda!
Swirl, swirl, slithery pond, and join with magic spring!
Swirl, swirl, dirty pond, and rid the cursed sting!
Here my prayer, I beg you please!
Now turn these curses BACK!