The one lakh tiger number is mentioned by everybody. It is just a guess. Whether the number of tigers at the early 1900s was 1 lakh or more or less is a million dollar question.

Some of these movies are more bollywood in style than actual wildlife documentaries. From the trailer it looks like a modern day Indiana Jones story with tigers thrown into the pot boiler along with guns and horses and what not.

The main problem that our wildlife faces is the lack of contiguity between our forests. The adolescent tigers have to find a territory for themselves. Due to lack of space and less prey density in the forests, the tigers have to move to the periphery of the forest and there they come in contact with cattle and humans. Most of them get killed. If there would have been contiguity, then the tigers could have easily moved in and taken the place of a tiger who died due to natural cause or due to poaching. So Sariska would have been repopulated with tigers on their own.

Cheers,
Sabyasachi