You don't need to be a hardcore fan of anything to want to revisit experiences from your youth and there's a lot more people playing games now than when Jetpack

You don't need to be a hardcore fan of anything to want to revisit experiences from your youth and there's a lot more people playing games now than when Jetpack Willy released in the 80s, certainly not a niche market. Think of the situation with today's games 40 years in the future rather than 40 year old games today.