Optical drives will be obsolete one day, but that day is still down the road. We need to have an improved infrastructure in our homes and businesses. I can tell you right now at work, I install zero software from a CD or DVD. I may use that CD or DVD to create an image or a snap shot of that program and then deploy it over the network.
This method will probably be adapted in the future down the road when wireless is every where and reliable and fast. Things will come in disk images instead of installers on disks.
So, I would include an optical drive on all future builds until that happens, and that could be decades down the road from now. Cloud computing may be the new way computers work, but then again it is not tried, tested and proved to be the way to go.