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They are and will be fully accepted as one in time.
You can look back through history and see any number of things which started as a new invention, served a purpose, became mainsteam, and were at least in part finally raised to an artform.
Art simply needs to be something which can serve as a form of expression and to be accepted by society as one it need only be well accepted by a relativity large group as a respectable form of expression.
Many groups already have accepted games as art and more will.
They are just as much art as any form of literature, musical and visual art infact the combine the genres and take it to another dimension by telling a story that changes and interacts directly with their audience.1THIS IS NOT RELEVANT ANYMORE