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No, I'd say that RAID is still necessary. RAID and solid state complement each other. There's a notion that RAID is just for disk drives, and that's not the case. One solid-state vendor, Texas Memory Systems, recently released a solid-state storage system that combines traditional RAM cache with multiple flash-based modules, with the flash modules actually configured with RAID 5 for availability and read performance using the read cache to offset the RAID 5 penalty. This is a great example of a hybrid systems, as well as hybrid drives, complementing each other with the RAID for availability and performance.
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Even some general purpose x86 class servers have been shipping for several years now with mirrored RAID -- RAID 1 for availability and redundancy purposes. It's a good fit across different technologies, and it's not just for disk drives anymore.
Check out the entire RAID FAQ guide.