I'll have two starters on my team for some time, and if there are other Pokemon I like better I'll just drop those two in my box. Well, I'll probably still keep Blastoise around, but we'll see. Definitely not using three starters, though.
I don't get why everyone's so intent on using that Torchic for in-game. It's not gonna have your trainer ID, so if you overlevel it any, it won't obey you! Besides which, my Fire-type will either be Litleo or Charmeleon, anyway.