There's a Roller Coaster Tycoon on the 3DS. Certainly better looking than this one but if it's the idea that these games are going portable, the one posted above certainly isn't the first. Actually seems like a perfectly logical platform for one of these games.
Big difference between "portable" and "mobile". I think handhelds like the 3DS are fantastic. You can guarantee quality games on it, it's a proven platform. Smartphone mobile games on the other hand are rarely considered good, let alone a legitimate platform for gaming. Find tons of the casual time wasters, but a proper thought out game is not generally one of them. We've seen series that go mobile tend to work out poorly. Mega Man, Final Fantasy, Dungeon Keeper, and there are more. Mobile just seems to lend itself to free to play games with awful micro-transactions or just basic games with not a ton to offer since smartphones don't have good controls or alot of power to them and isn't exactly the most unified platform.
I don't think the mobile versions of these games are meant to replace existing games on existing platforms, more as a compliment for those who enjoy a certain game and would like to play a smaller version of it on the go.
Remember those old LED handheld games in the 80's that had pacman, galaxian, or donkey kong? They didn't didn't hurt the sales of those IP's on consoles.
Hopefully the worry here isn't that smartphone gaming is going to hurt console gaming. They're doing plenty on their own to hurt their own sales.
So don't worry, nobody's soul needs to die.