Why is this an exciting time for aviation? Or more specifically, why should I (a person who never spends more than $2,000 on air travel) be excited?
Assuming Boom or someone else makes it, it's potentially interesting if you routinely fly business/first class today. Which is thousands of dollars for trans-oceanic flights. So, yeah, if you're looking for bargain economy fares this likely won't ever be for you.
Because I can get somewhere faster for the same price over time.
Increased adoption will put price pressure on traditional flights making them more affordable