I think that SW7 analogy does not work here. Disney is exception to this article and their movies are profitable, big time.
Remember, Disney put out 'Land before time 13' because they made money on the first 12 'Land before time' movies. But, 13 was never going to see a movie theater.
You keep comparing "Star Wars" to "The Land Before Time". I think you vastly underestimate the popularity of Star Wars, particularly the past 2 movies.
Movies that build off of that success make money, but they don't prime the pump.
Also, "The Land Before Time" was a Universal Studios product (per Wikipedia), not a Disney product, so the starting approach is very different.