You can do that today, check your options in iPhoto, iMovie, etc. And you can synch files automatically to iDisk and you can access your pictures and files from any computer, on any platform from anywhere in the world with an internet connection. BTW, you can also automatically synch and back up your music, movies, documents and just about any other content from your hard drive within the space limits. Either manually or fully automatic. My iDisk is a mounted drive on my desktop, I drag and drop to/from it all the time and use the Apple Back Up utility to automatically synch other files, the MM synch tool takes care of the rest all seamlessly and automatic.
Honestly, $99 aside, I do not see where MM loses to Dropbox or Google here. Plus you are getting 20 gb of storage along with email and calendar syncs. I am struggling to understand why so many people say Dropbox is better, other than the 2 gig free part.
I think a lot of the people complain about MM just don't know how to use its features. Of course, if all you need is less than 2 gig of storage, then Dropbox wins hands down, but when you want more, MM isn't really a terrible option. It would be a shame if they stripped it and dumbed it down to cut costs and make it a file only repository, removing all the great OS and app integration.
i thought i would give google a try