Technology

That will not be a marketable skill, if the intended "customer", who just wants the end product, can do all of that themselves.

There are already improvements being made in understanding the intent better, which will eventually render all "prompt engineering" unnecessary and obsolete.

The necessity to tweak prompts will be a very short-lived thing from these early days. At best it will give you an extra year or so.

Similarly if you picture yourself as an owner of a company - you cannot sell something to people that they can just make themselves with zero effort required. Especially in an environment with a million competitors. At best your moat could be the network effects of a large user base, but that's not an easy place to get to.