What would Tesla's P&L look like if they cut R&D and stopped expanding at such a rate? In such a case the more profit they showed the lower the stock would get as the company would be unlikely to have a future. They are actually doing the right thing for their stage of development in trying to scale as rapidly as possible and lessen dependency on one model. After all, the car industry is one of the toughest around and is also generally consolidating.
Their stock price would not be a motivation for changing their plan currently, would it? Like any such valley company, their issue is speculative and can only be seen in those terms. They don't make canned dog food. Psychological warfare here is a waste of time. The long term persistent negative posters used to claim that no cars wold ever be made, that none would ever be sold, etc, etc. They have generally posted their way entirely out of any credibility.