Kind of late to the party..but..
Wired Home Internet
So much internet traffic is video and that's only growing. Driving the need for more and more bandwidth. I think that widespread fiber to the home is more realistic instead of just wireless which is subject to a whole lot more kinds of interference.
Dedicated Cameras and Camcorders
Pretty sure dedicated camera's and camcorders will be around in some form. I wouldn't want my smartphone for everything; its good at most things but master of none.
Landline Phones
Business or Personal?
VoIP has and is replacing a ton of old POTS lines. But we still see backup lines for saftey and backup purposes for VoIP systems. For the personal consumer I can see it going away. I already moved over to just a cellular number and no landline.
Slow-Booting Computers
Moore's Law in full effect, we are already seeing fast boot times. I think as more tablet become more mainstream in day to day tasks people will expect the pretty much instant on and ready to go. Virtualization is becoming better and better. Businesses are seeing that and some have shifted to move a lot of business applications and servers to virtualized environments. Desktop computing is not too far behind. Either a thinclient/zeroclient, or even integration with a tablet. Tablet Dock/Monitor/input devices but less hardware to purchase. Perhaps even an option to have the user bring their own and use it to work eliminating the need for the business to purchase. Maybe not today but in 15 years its a real possibility.
Windowed Operating Systems
No way this is disappearing. I see more of a shift. Virtualization (O/S Inception!)
How we use will change for sure but a type of operating system is still going to be there.
Hard Drives
Not going away. less moving parts with SSD. Where else did you think you were going to save all your pr0n and music? The cloud?
Movie Theaters
No way. It's fun to go out to the theater sometimes especially IMAX films. Not everyone can afford a monster sound system, cinema sized screen, and the anger of neighbors in apartments/condos etc.
The Mouse
Hard to say. I hope it goes away sometime in favor of computing surfaces like that desk in...crap can't remember that movie. As a trackball user I hope everyone converts to that instead
3D Glasses
gimmick...go all the way to holographic technology please.
Remote Controls
home automation is going to get cheaper and easier to install and I can see a lot of new homes with systems installed. Pretty sure voice commands or hand gestures will be the "wave" of the future.
Desktops
not going away. power users will still have them. But I don't think they will be as popular as laptops/tablets.
Phone Numbers
No way these are going away entirely. An easy way to remember a unique ID to dial you is still required.
Primetime Television
I think studios will create Primetime content but people will consume it when they want.
Fax Machines
I hope they go away.....soon.
Optical Discs
As mentioned before that Blu-ray would be the last. I agree with that. It's a good stop gap for awhile until fiber is everywhere. After that why? I can download it faster than going to the store to buy it. The movie/music industry needs to change though, I can see them dragging it out for a really long time..