What could ELT publishers learn from startups about product-market fit?

What could ELT publishers learn from startups about product-market fit?

How many of your customers would be very disappointed if one of your products ceased to exist tomorrow? How many would register it only momentarily before replacing it with something that, as far as they’re concerned, is more or less interchangeable? My guess would be that (in the majority of cases) they would be only marginally inconvenienced, and this is something of an inconvenient truth in ELT publishing. Right now, we’re witnessing Product/Market Fill, when what we should be aiming for is Product/Market Fit. What does that mean, and what can publishers do about it?