Re: *Will the iPhone 5S make you switch to the Samsung Galaxy S4?
I think the real question is "Will the iPhone 5s bring anything new to the table/Does it need to?" or "Will the SGS4 bring anything worthwhile to the table?".
iPhone 5 is great hardware, but brought nothing compelling in terms of features. 5S will likely be another spec bump, mostly in the camera department, and hopefully something compelling in terms of features - maybe an innovative use for NFC.
SGS4 is looking like another big phone in a sea of big phones with some radical new features that have limited novelty appeal (looking at you, eye scrolling).
Chances are, happy iPhone people will not jump ship. I'm with Rene's assessment that perfecting its exclusive services is the most important thing Apple can do with iOS. Keep making Siri more accurate and more capable. Keep making Maps better. Improve the reliability of iCloud/Messages/etc.
Absolutely. I don't see either bringing much new to the table. It depends on android and iOS. Not the hardware.
But this is the reason why Apple's stock is tanking. Even with a retina mini or a bigger iphone, the problems remain the same for Apple.
Getting a grip on marketing and the message they push out is problem number one for Apple. Invest in software and ecosystem. The odds of Apple finding another "perfect product" like the iphone is slim. Being able to sell a premium product at mainstream prices with help from carriers is hard to reproduce.
The immediate concerns for apple should always be that iphone. It's their most important product. It's absolutely unbelievable they don't have a bigger screened branded iphone launching this year (if the rumors are true that it's not forthcoming this year). Sure, it could come next year but that's an awful long time to concede that space to the competition. A retina plus 4.8" iphone could make the HTC One or S4 look silly. It'd only be a bandaid for what is really hurting Apple but it'd be a well placed one that could help give them time or at least right the marketing ship.
When I read articles that Apple could reasonably release a bigger iphone with the same resolution, I just roll my eyes. A non retina (ok...a lower ppi) iphone? That's just stupid. Sure, it would sell. But the damage would be done. The media would have a field day comparing this to phones like the HTC One or S4. Apple may as well release a "kick me" sign.