1- Add iCloud versions/Time Machine or some other way of backup, once people migrate their data to iCloud traditional backup methods become impossible or at least highly impractical, add to that the ability to delete files from any device and the lack of backup starts to show all the signs of a usability nightmare.
I do not expect the majority of people to bump into this until they are deep into relying on iCloud for storage in the years to come, but they eventually will and
Apple should have something ready as soon as possible.
2- Fix iTunes (including AppStore, iBooks store etc) discovery and search, it is pretty much broken at the moment as plain text searches yield hundreds of results with irrelevant sorting by download counts.
Having so many featured and suggested categories is a weak solution and it makes no sense since it copies the model of the entertainment business which works totally different from that of software, it is no use to have billion apps in the store when the actual 0.1 of the apps get 99% of the users (just a illustrative estimation, not factually accurate)
It looks like they just copied their music store model piecemeal without giving it a second thought, and it should be pretty clear by now that a custom approach is needed for the app stores, a good model to emulate would be Netflix, the way it works to highlight new or relevant movies to you, not just push the already hyped and popular blockbusters down your throat.
3- Fix AppleTV by adding the “passive” mode to every stream eg: shuffle for Music, play top Podcasts, play my Vimeo Feed, that is analogous to legacy TV behavior where we quickly select a passive stream (TV channel) with minimal effort, this has to be available in every content module in AppleTV, accessible with preferably a single user interface interaction/dedicated remote button
Preferably it should also be smart and pick content based the user is statistically probable to like, not just push the most popular content (see #2 above)
4- Fix OS X for the post-pc era by removing it’s features that were added specifically for the kind of audience that migrated to iOS devices.
Consciously and explicitly switch to a paradigm where they consider the users for OS X professional tech-savy users as opposed to the iOS users and start to design software accordingly, specifically adding more finesse to OS X and make it tend to the professional and technology savvy.
We have seen signs of this with the revival of Dock support for symlinks, Finder folder merge etc, but this should be made into a explicit direction for OS X in order to focus it on the post-pc users that are not merely using it for web browsing and content consumption.
With MountainLion they pretty much achieved the needed synergy between their two OS’es, from now on it is time to play on each individual one’s strengths.