I made it first principle of mine that I assume the good intentions in others. That's why I will give you an honest reply. I look at this from three perspectives:
1) History / Tesla perspective. What you worry about is what we have heard about the Model S from early 2013 - this exact concern. "what will happen with demand when the first xx number of cars are delivered". In reality, nobody buys a Tesla just like this. They see it at heir neighbor's then they buy one. Ask around. You will see. So the more Teslas are out on the road the more are being sold.
2) Competition perspective: Read this article here:
Tesla Model 3 vs. US Incumbents — Gun In A Knife Fight Or Fair Fight? | CleanTechnica it quantifies the damage that the Model 3 will inflict on the competition.
3) You can see in real-life how Tesla manages demand. So far there are a lot demand levers not being pulled amongst those are:
- Model 3 not available in all markets where Model S / X are available (incl. RHD, but also some European countries)
- Model S3X are not available in all countries of this world (ref. Middle East, India, South Africa, Latin America, etc.)
- No Leasing for the Model 3
- Many options that would lend themselves to "a low monthly fee" vs. a "one-time big payment" are still on the "one-time big payment"
- No fleet deals (company cars)
etc. etc.
So yes, there are always concerns with Tesla. Always, always. But demand for the Model 3 is not one of them