Sony won't go away after the Vita, there will be a successor Sony handheld to the successor Nintendo handheld. Who knows, there are rumors that GT6 could be ported to the PSV, and if that's the case, Vita sales could rise sharply.
You also never know what could happen, Nintendo almost died out inthe console war, but then suddenly a good move with the Wii and a mis-step with the PS3, and Nintendo is ontop again. PSP3 (PSV successor) could top the next Nintendo handheld, but I doubt it.
Sony is here to stay as an alternative/compeditor, Vita is not that last.
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As for compeditors outside of Sony, I don't see it happening. If anything Nintendo will be compared to iphone/android gadgets, but as a dedicated gaming device, it's Sony or no one. Maybe Sony will change their gameplan and make a playstation phone, but we'll see.
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