Future of storage media

My dad and I have this arguement:

I say that before long, cell phones will encompass nearly all handheld devices into one device, and use a hard drive to store everything in. (A mini hard drive, ala iPod.)

He argues that before cell phones become that advanced, flash memory will also advance to the point where hard drives just aren't needed as a storage medium. He says that flash memory will grow to several gigabytes in size, and since flash memory has no moving parts and is faster, THere will be no reason to include hard drives.

Which situation is more likely to happen?

"cell phones will encompass nearly all handheld devices into one device" no, they will not. there is a very good reason why 'all-in-one' devices have not sold well in the past. when you incorporate more than one function into a device, you compromise each function to facilitate another. most people just want something to do one thing very well. as for the answer to your question, my answer is "moving parts = no" solid state memory is where its at