If an ingame character would say to me "do you want a starter from Sinnoh?"...I would say "Yes,*****,I would want one!" They are cool,especially Turtwig and Chimchar.
Those are the ones who aren't cool...
And on the topic of getting other starters, I would want them to wait until the post-game, if we even get them at all. And I would hope that whichever gen's starters are offered, they have they're DW abilities.