Facetime support would be with ichat NOT ilife
no one has said they are getting rid of iDVD at all. but there are several things they could do
1. continue to not update it.
2. take it off the disk but make it a free download from the site
3. blend the appropriate functions into imovie and iphoto
4. shift the various 'upload to youtube' type functions into an 'share' app that would also have the burning functions
likely since they went intel only for the the OS already.
based on what? that they didn't release 10.7 this year, one year after 10.6 even though they generally have the OS on a two year cycle.
based on their putting a focus on new tech this year at WWDC for the keynote, despite having several Mac OS panels and such.
Fact is that right now there's really not anywhere for OSX to go. There's no new tech. iOS is where the changes were possible. So that's where they went. It doesn't mean that they don't have a whole building of folks working on better computer hardware and improvements in Mac OSX
There is plenty of new technology and advances in current technology. Your point about 18 month cycles is key.
Apple has a huge market presence in the embedded space and to ease off on that would be a huge mistake.
OS X is churning along as always. People need to stop worrying. With Bertrand and Scott from NeXT overseeing their major OS X improvements nothing but evolution will come in the next release with a few revolutionary solutions.