Yes, the ecosystem and ease-of-use are the two main reasons I continue to buy Apple products. One time, Apple's arrogance and insistence to plough their own furrow was a major plus, to protect the consumer from bugs and overly-bloated software, thus offering a more streamlined experience. These days, however, particularly when you look at the features offered by Samsung, Microsoft and Google, it seems restrictive and prohibitive. The lack of customisation is a real drawback - with both hardware (particularly in the Mac lineup) and software. Apple are beginning to disappear up their own backsides, IMO, and they really need to listen to what their customers want, whilst also improving quality control (e.g. Maps, antennae issues).
Another bugbear of mine is form over function, one example being my new iPhone 5. Whilst it looks and feels beautiful, the 'slate' finish is not robust and, even though I use a cover, has worn off on several edges. My friend's new Samsung phone, although less alluring, has a more solid feel to it and probably won't scratch as much. I shouldn't have to cradle my phone like a newborn baby to keep it looking smart!
I also think the phone is too thin. Don't get me wrong, it feels nice to hold, but an extra millimetre or two would have been fine if it meant a longer battery life. Ditto the functionality that has been lost by making the new iMac thinner - it's a desktop computer FFS!
So, to summarise, I am concerned because, whilst making simple and 'sexy' products was once enough for Apple, the competition have really got their act together and consumers are becoming more savvy and more demanding. The only reasons I chose an iPhone over the competition were ease of use and the ecosystem, but if Apple doesn't address problems such as high accessory prices, quality control issues, missing features and a lack of choice, I believe they will lose a lot of customers, possibly myself included.