Platform as a Service. Remember that "aaS"?

So it seems that there has been more and more interest in platform as a service (PaaS) over the past year. Developers writing code for the cloud will definitely be happy as more and more tools are launched.

Mainly, I'm curious to see the rate of adoption of the various platforms. Will it be as tentative as infrastructure as a service was, or will it be more rapid given that the market's comfort level with cloud computing in general has increased?

My personal predictions:

1. Developers will increasingly develop true software as a service applications (SaaS) and apps for the mobile world leveraging the elasticity of the platform and infrastructure.
2. PaaS will be the battlefield for cloud. Much like the OS wars and the browser wars, the vendor whose platform is the most leveraged or used to develop cloud based software and mobile apps will win.
3. Mobile will be a major driver for PaaS adoption.

.Net is one of, if not the dominant platform available to developers these days. Apple has Cocoa, SUN puts out Java, and a myriad other platforms like Ruby, Python, etc. are available for developers these days.

Will the winner of the PaaS war integrate multiple other languages as well, or will it force the market onto a standard offering of 1 (or 2-3) platform(s)? Will the other languages become niche platforms that smaller providers will offer?

There are many questions at this point with few answers but I suspect that the winning vendor will have to offer some options to remain relevant to the market and maintain overall leadership.