This may well be true, but another reason is economics. It's easier to do a remake than to find an audience for a new movie and hope it's popular.
For a remake, the characters and basic situation of the story have already been established, so it's a lot simpler (and cheaper) to make a script using material someone else made a long time ago.
In many cases, however, the remake movie just isn't popular and is a "flop" (failure). This may be because times have changed, the new actors aren't as good as the originals, or a bad script.
Sometimes a new movie isn't actually a remake but more of a continuation of a popular movie. (a "Sequel")
Lately, there's been news of Top Gun 2, a sequel to the 1986 movie starring Tom Cruise, but details are unknown at this time.
"Independence Day: Resurgence" a sequel to the Will Smith movie of 1996, but Smith isn't starring in the movie, which will show this year.
Remakes are also coming of "Ghostbusters", "Predator" (original starred Arnold Schwarzenneger), and many others... (G.K)
This may well be true これは本当かもしれない
details are unknown at this time 今は詳細は分からない