Cars are obvious. Humans like to move around a lot and, as a species, we're predisposed to solving problems as quickly and efficiently as possible. So what could be more obvious than inventing an object that moves around under its own power, carries people and cargo, and only costs between ten and ninety percent of each paycheck? If cars had never been invented, it's likely you would have come up with the idea just this morning.
Unfortunately, most creative ideas appear brain-dead obvious in hindsight. Why of course we came up with refrigerators, tube socks, and the printing press! We can't imagine our lives without them. But when it comes to looking forward, things get a bit more difficult. Sure, anyone can read a Harry Potter book and think, "Heck, I could've come up with that!" But the odds are: no, you probably couldn't. And neither could I.