Yes revenue would drop but so to will expenses. In fact S&M which accounted for ~55% of their cost to sell 1 unit should be negligible. That said they will struggle to fund R&D with revenues at first.
Before S&M was about 55% & Cogs about 23%. Once you take these out of their current model their margin is 22% with admin costs. Oem model their margin is 25% with at least some G&A costs factored in the purchase price.