TLJ has achieved the largest box office drop of all the Star Wars films, including the prequels. It's only a downward spiral from here, especially after people watch it multiple times on blu ray. They'll pick up on things that they didn't notice in the theater.
That's all false narrative silliness. I'm aware of videos perpetuating the myth but it gets no traction with those interested in reality. Sure studios never want a huge second weekend drop but it's a mathematical inevitability that the amount of the drop will be higher for films that earn more. The last Harry Potter had a similar drop and no one thought that that series ended on a low note. What I find more impressive is the surprising legs TLJ has exhibited *after* the drop, some days even matching TFA's earnings on its equivalent days of release! And it's still tracking above every other blockbuster short of TFA. Not exactly a franchise killing disaster.