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There are very few instances where graphically astounding games have been released that just didn't have the gameplay included, so no matter how good they get the graphics on the next-gen consoles, they are sure to include enough gameplay to keep us interested.
Graphics isn't the only beneficiary of these new powerful machines, gameplay also benefits in that more complicated and powerful game engines can be developed, more involving storylines can be communicated, more things can happen on scren at any one time without noticeable loss of frame rate, more avenues in quests can be opened up, and these things overall contribute to how the game plays.
If consoles do help to reduce drinking and driving then perhaps everyone should be forced to own one, like car or house insurance.
The more detailed the graphics the better, but this does not mean they have to be "realistic". Graphics can have a unique style like Jet Set Radio.