Under that argument, there's no point wandering around catching 39 legendaries after you've completed the Lauren League.
It could always be connected somewhere to Lauren. Nature Preserve is an idea (for Grass types NEway), but they could still be added to a volcano area (for Fire) or to some watery area (Water types obviously). Connecting all three in one area might be tough; three special areas around Lauren - where the starters are bred for new trainers - would be cool.
I didn't know professors eventually give out more starters. I'll look into that. When does that begin to happen?