One difference is that the original games are still readily available, often included as 'bonus' content on game discs.
Another difference is that the technology of video games is ever evolving - our expectations of games and the experience has changed every month.
With cinema, the tool and the product have essentially stayed the same for decades. I think people are a bit more reticent to accept change in cinema than they are with video games. The format of video games changes daily, and with film, it's stayed the same.
But good post.