True, however the assumption that Vyvanse market will get cut in half is way too pessimistic. Generic market share is currently sitting at around 75% so the most the IQVIA annual sales could even possibly decrease from future generic entry is around 25%, and even that would be if there was 0% branded market share. Given this I think mrwn2010's number's are feasible if not conservative. Reason being, that while the IQVIA annual sale numbers are not a 1 for 1 conversion in terms of potential revenue for Elite, due to the reasons you stated, the total IQVIA market should be estimated to be around 3.5 billion or even higher, not 2 billion, when factoring in decreases for generic entry.
My opinion.