For now I see Android competing with iOS but I do think it's just a matter of time before there will be no advantage for Apple to continue developing their own OS. Woz is right, Apple could easily find themselves in the same situation as Blackberry and they need to be ready to deal with it.
With respect to VHS being 'open', that wasn't the case either. I'm pretty certain that every VHS recorder sold included a license back to JVC. Now, it's true there were far more manufacturers of VHS recorders but Sony was not the only company to produce Betamax machines. Sanyo and Telefunken also produced them and there are probably others I'm not aware of.
There are far too many myths regarding this sort of thing, each markets had different issues. The practical reality was that Betamax probably was a better product in many respects, certainly the majority of Sony machines were built as premium products. Also, Betamax generally had features before they appeared on VHS (shuttle search, peep search HiFi - not just stereo - sound). However, none of these were enough of a factor in it becoming dominant. VHS, with more manufacturers was often a product you could find cheaper and still had enough features. Although you can have a long argument about picture and sound quality, if Betamax was better, it wasn't enough to make enough people choose that product.
What I want is to be able to take notes that are organised by date as well as being integrated to a calendar (preferably Google). Additionally, I want to be able to prioritise my work along similar lines to GTD. I'm not averse to spending money for the right s/w but prefer to use free s/w where possible. Can anyone suggest what could be used?"
To use windows as an example. You wouldn't expect the usage of windows to change that much during your usage of a particular version. XP, probably my favorite (if such a term can be applied to windows), stuck with basically the same layout in terms of desktop, menus and directory structures. It never evolved substantially throughout its life. Ubuntu on the other hand (and a whole host of other GNU/Linux based distributions), can change it's look and feel substantially between different versions (ie, every 6 months). I don't think that windows would have been a success (in commercial terms) if it changed so much so quickly.
Whilst I accept that there are very good reasons to move forward, the issue I see is that not enough effort is put into keeping existing users happy. We want to keep up-to-date but we don't want our experience of the system to change too much. When Ubuntu was still using Gnome 2, you got a fairly nice progression. Gnome 2 improved but did so quite slowly. You also got a chance to say yes or no to wizzy 3d effects. I, and I suspect many others were happy with a slower improvement and this is probably better than the occasional but much bigger jumps that MS would have done with windows.