Philippe Kahn, the founder of Borland, once gave me a very good piece of advice: "Don't ever give your customers a reason to reconsider." Why? Because when customers are forced to think about their buying decisions, some of them are going to shop elsewhere.
I am not too worried about Apple they haven't killed off their R&D division and so they are going to keep on innovating. They are really good at that. Sure it might be a little rocky but it is a good time to get into Apple development.