This is fishy
I have been using it for so many years, along with a lot of other people I know.
I turn my computer on and do all my offline stuff, then when I want to become 'connected' I open a browser. Right there, in one tidy layout, is all the latest stuff that I need to know about on the web. Simple and effective.
Apart from having my computer on and then reaching for my mobile to check the widgets, I don't know of any suitable alternative for the desktop and I'm not going to use two devices, it kind of goes against the grain of what every other company is trying to achieve.
Wait a minute, I smell fish. I think iGoogle is a lot more popular than they are letting on. Probably all the functionality provided by iGoogle will be moved to Google+ apps and then that will force you to set Google+ as your home page, thereby giving them a hit every time you open a browser.
I have never used facebook and probably never will. I did not like the idea of being automatically registered for Gogole+.
If they try to integrate it any further into my browsing routine then obviously I will stop using all of their services.