IMHO Mobile Me will abandoned (by the higher ups at Apple) like .Mac was after the change from iTools.
Just they abandoned .Mac many (I think like 7?) years after its introduction and after all of this hard organizational and technical work I think they'll keep MobileMe for at least another 4 years. Otherwise it wouldn't have been worth it to introduce it.
Personally I don't like MobileMe, because it just isn't what you would expect of such an expensive service.
What was .Mac? It wasn't just an email service with a calender and some contacts, like hotmail etc. It was a portal. You could create your webpages online, make your own groups, read tips on the .Mac blog page, go to Member Central and download apps and jam packs, send ecards, have your bookmarks with you wherever you go... I could go on and on. All of this was available at mac.com - not in separate apps in your Finder or anywhere else.
So what is MobileMe? Well its basically me.com which is the same like hotmail.com. Both have email, calender and contacts. Just MobileMe also has an online iDisk webpage. Well thats great, but what if you use Apple Mail or Entourage for your mail, Addressbook for your contacts and iCal for your calender? And everyone who needs to access their iDisk anyway goes to the finder. So whats left? What else does it offer? Not a lot, I can tell you. Only uploading webpages with iWeb, photo print outs etc. with iPhoto (none of this is new by the way) and the syncing of mail etc. with your iPhone and iPod Touch.
Did anyone notice what the ads of MobileMe were about? Push. Push contacts. Push calender. Push email. Every since MobileMe ad had the word push in it - that was the only marketing they could do - because there isnt anything else to market in MobileMe!
And then that message that actually it isnt even push, its just an automatic sync every 15 minutes (on your computer at least).
Quite disappointing I must say.
And now I understand why they made MobileMe cheaper than .Mac.