Not likley, Nand flash technology has become so advanced and cheap with a bit more time and proper backup with high speed buffer memory that it will eventually supplant smaller drives, and magnetic drives will be relegated to 'low speed' high volume storage. If you look at the price per megabyte of disk space larger drivers are so much more cost effective, and flash drives are so cheap and their performance improving every day that eventually they'll start being used for primary system files, especially with modern journaling file systems which make flash drives practical from a repeat use perspective. It's already happening for some netbooks, and there are no cellphones I know of that use hard drives. Although I'm sure someone could dig one up that does. Probably a very unreliable one.
Personally I think more hybrid solutions should be developed. Silicon is cheap nowadays, a bigger cache memory can be a major boon to the performance of many applications, flash memory could be used as a sort of large cheap but fast L2 style cache, holding larger chunks of frequently accessed data, and modern processors and journaling file systems are becoming so advanced that merging them all into a seamless device from the appearance of the host device is practical. Linux 'livecds' already use hybrid static storage (like a CD) and merge it with a ramdisk and/or flashdisk to allow for dynamic changes to the file system due to a journaling file systems abilities.
Because of the advances in technology, I personally hope that the market follows up on these kinds of ideas, mind you I sure hope someone smarter than me is already working on practical systems along these lines. For far too long the storage industry has simply looked at data density OR access speed as a measure of their products, rather than how they function under real work conditions, and in real world devices, and there have honestly been almost no major advances in how these storage mediums are actually used under a mass scale since the advent of the original high speed leaps in storage.