The second part is pretty much Apple's vision for iOS 5, Lion and iCloud.
/That/ would be awesome. But I don't think iCloud will quite be that (yet).
Anyway, I had a broader point and was only using browsers as an example. The ideal here is a universal login that allows me to be at any terminal/device and have my working environment there in its entirety (or some device-appropriate representation thereof). Things like Dropbox are nice, but they're certainly no substitute for an integrated, comprehensive solution and offer little or no value to me right now. (Hey I've got an iDisk if I want to share some files with my devices or friends.)
Well, then, given that it solves a problem you have, maybe you should reconsider that.
I get your general point, but your vision seems to require being locked into one vendor, and I certainly don't want that, especially since I don't use any of the vendor's software.