gerbick@
So ecosystem for a desktop would be repositories, netflix, media...fine, you need all this, many others do, I'll accept your view on that.

I never used ovi or iphone or anroid or netflix and haven't bought a cd/dvd in the past two decades.
Why pay for content when so much of it is free.
Do people actually buy a dvd on their phone, by their phone, for their phone with liberty and justice ? Boy, they sure do mean unlimited in those data plans !
I download stuff and view it on my N900 with no ecosystem whatsoever. I have installed apps so I guess I do use the ecosystem, since by your definition a repository is an ecosystem.
Enough about me, I am no example.
My Desktop example, though true, is a bit extreem - to make a point - you don't need 20,000 apps, just a few good, complete applications.

You gave plenty of examples of why you as a developer to several platforms need an ecosystem. What you didn't do is give an example where a common user with a good-as-an-old-desktop phone would require services and tens of thousands of apps.