What has an enormous impact on the style of music is how the cultural valuation of said style is. In the West classical music is commonly agreed to be the peak of musical articulation, cinematic orchestral music commonly sees itself as one successor of that style. Seriousness and abstractness are considered better qualities than the pure focus on melody that ended with the Baroque period and gave way to the increasingly multifaceted interplay of instruments, performances and the execution abstract concepts.
In Japan and East Asia the valuation of pure melodies appears to be more widespread still. I personally link that to the higher acceptance of the concept of cuteness as something beautiful (that can be kept) instead something childish (that need to be done away once reaching adulthood). Music genres like Progressive Rock only enjoyed a rather limited time in limelight in the West while in Japan it was more readily accepted as a valid style in the scene and still influences many musical areas, often indirectly by embracing the Baroque style of composing.
As for how game music is seen in like 100 years later I'm afraid 99% of it will be forgotten as its recognition is simply not widespread enough, seldom archived, made available and listened to outside of games. That aside popular chiptune compositions already form the rise of an own genre which will keep the classic style game music alive as a specific retro electronica genre. Newer compositions relate more to the actual genres they are composed in, but whether they'll be noticed and valued as equal to more popular compositions in the respective genre depends on the knowledge about and popularity of those pieces. That's again limited to a very small amount of the whole amount of music available in any form of games.
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