Here's my take on Apples current situation and future.
Apple's revenue shows that they are having more and more of their eggs in the iphone basket. Its 56% of their revenue, and the next highest item is the iPad.
iPhone is stagnant. The design changes are mostly minor tweaks to the same design they've done for years, and the iOS software has lagged behind Android significantly. Couple that with the missteps in Maps, and the general over-saturation of the iphone and you have a product that is rapidly becoming nothing special.
If the product no longer commands a premium that supports their margins, they really only have few options. Either they can move it downmarket (as they have done with the 4(s) and let margins collapse (although their revenue will increase greatly), they can release a revolutionary phone that again recaptures the desirability crown (considerably tougher without Steve, and with a more mature smartphone market), or they can try moving to different markets /creating new markets.
The biggest change for Apple is dealing with the consequences of being mortal once again. They aren't going to beat estimates every single quarter for eternity, and the stock has re-adjusted to reflect a company that makes good / great products but operates in markets with strong competitors which offer equally compelling products.
For Apple to thrive, they need to be first to market. Without Steve, that's not guaranteed, and they will need to be aggressive to keep their edge.