The studies already exist, though. I don't think any of them questions the fact that monasteries benefited greatly from serfdom/slavery; the dispute is about how horrible it was for the rest of the population. (Random Wikipedia quote: "Tibetan communist Phuntso Wangye recalled his anger at seeing freshly severed human ears hanging from the gate of the county headquarters in Damshung north of Lhasa in 1945".)