I think Wandering Earth and Three Body Problem are different.
In terms of original books, Three Body Problem series have been more popular and higher status. Although the book of The Wandering Earth also told a great sci-fi story, general audience especially sci-fi fans didn't expect the film version could work as a sci-fi movie or retold those major plots from book until it debuted in theaters. The expectations were very low. And the movie earned huge money and great reactions even though it ignore the original story and characters from book.
But for Three Body Problem, general audience have a total different attitude on film retelling. If filmmakers of the movie just use the concept of three suns and ignore any major plot in books, people will definitely show strong resistance, because the consciousness for Three Body Problem have been formed by the books. Any news or detail incl BTS stuff will be closely examined by public. Any slight difference could cause big controversy. It's like the Bible of Chinese Sci-Fi, like what OT of Star Wars mean to die hard SW fans. And what TWE crew did is like what Marvel did for MCU with second-tier characters at beginning.
If there is a TBP movie, it will easily top what TWE made for opening box office. But the story is hard to be told as a movie. The book is too complicated to be adapted in terms of story structure (in some ways it's like DUNE). Censorship will also kill some major plots and character motivations. And yes, those can be replaced by different history events and characters, but it will make people angry and think the movie only have a title call TBP.