Hi Wolfgang. For me, I can tell how you're able to list a number of annoyances through your experiences with Cr-48---at the same time as your usage of it has evolved from web browsing to a research and text authoring workhorse.
I've found that I'm using cloud services 20 time more than I was before I started with the Cr-48: for writing, then shared writing documents, spreadsheets, collaborative spreadsheets, presentations (If I plug in a VGA projector the Cr-48 has 1080 x1920 available), and with a USB mouse plugged in, for drawings.
I expect that cloud concerns will go the way of, um, let's see... There was once a time that people were very skeptical and uncertain about using ATM/debit cards to get cash. That time has passed, and concerns were overwhelmed by the convenience that has taken their place.
For cloud storage, I'm enjoying major convenience bonuses as I am able to work on the same document at work, at school, at home, and sitting down at a coffee shop. I don't carry around copies of the document, establish a connection other than an Internet one that's usually there anyhow, and I can collaborate in real time if need be, without having the file locked by whoever got there first. Both Google and Microsoft (Live) have recognized this as a really good model for how people manage ideas, and work together. Beyond the specialized niches of software development or other intensive computing demands, nearly all people benefit from better information management---not least of which are programmers when it comes to the documentation, client relations, or office management aspects of their work.
From my personal view, using Chrome OS has opened up my appreciation of how ideas and collaboration can be better served by computing than the desktop+file+file server+workstation model. It won't go away any more than human tellers at the bank---but there's plenty of information transactions where the cloud is a better solution. And for those aspects, Chrome OS and similar cloud-only devices with full-sized keyboards, a minimal screen, and maximal connectivity and battery life will have a place. Streaming audio (VoIP) and Streaming Video (Netflix et al.) seem to me like they will be reached first by the smartphone+4G+Apps model.
As I take the Cr-48 around, it's been a very rare thing to not have connectivity enough for document and collaboration work. I've taken it as far out into the hinterlands as GPRS, where I was looking forward to EDGE, then stopped at a restaurant (WiFi) before hitting the road again and being happy to return to 3G civilization.
Oh, and when you run out the 100 MB allocation, then and only then does Chrome OS present you with an opportunity to buy a 1GB-in-30-days offer from Verizon for $20. Meanwhile, your 100 MB/month allocation will roll over if you don't use it while on the prepaid data plan.