CI 2.0 and the future

[eluser]Jelmer[/eluser]

Searching the CI forums, it seems that CI 2.0 have been in development for at least 3 - 4 years (I seen posts dating to 2006), is this an elusive milestone? is CI 2.0 like Gran Turismo 5?

I'd guess there have been questions about "2.0" pretty much for as long as CI's been around. There has been a consistent (but slow) development you can see in the changelog in 1.x versions but there wasn't anything official on a version 2. The real second version has only been anounced a short while ago and can be viewed in development on http://bitbucket.org/ellislab/codeigniter. It's at the base of EllisLab's recently announced new product (MojoMotor) and they'll probably upgrade the version at the base of ExpressionEngine as well. (EDIT: I was mistaken: it has been the base of EE2 since the beginning)
I wouldn't be too worried that they're not going to make very sure CI2.0 is going to be a very stable codebase and it probably won't take too long for a first release either.

Does CI have an ever growing install base?

I'm not sure what you mean by this? If you mean the number of libraries/helpers, there is some very small growth but I wouldn't worry about it becomes a huge number. That would pretty much defy the whole point of CI itself.

Will CI ever become the massive behemoths like Zend Framework, Symphony and CakePHP (I hope not)?

I'd guess about the time that hell freezes over ;-)