The problem is you just don't know. You might create a new market where none existed or completely take over a very crowded market, or (much more likely) fail regardless of what your marketing research told you.
How does the author explain the huge success of the original UNIX? It violates everything he says. Certainly Dennis Ritchie and Ken Thompson weren't thinking about the size of the market for a new OS. UNIX was incompatible was everything that existed at the time and AT&T could have used an existing OS for everything they needed done.
Facebook is another good example of you just don't know. Probably there were a thousand other equally smart Zuckerbergs trying to create a social whatever in 2004. One succeeded and 999 failed. Was it because Zuckerberg was thinking hard about the market and the others weren't? Many of the factors you don't understand, don't control, can't predict, and can't even explain more than a decade later.