I meant in the context of trying to build a long-term business. Netflix would be dead in a few more years if they hadn't started doing digital streaming.
You wouldnt leave a $100 bill on the ground just because it doesn't come with a money tree. Even some non-sustainable businesses may be worth pursuing while they are viable if the benefit/payoff far outweighs the cost/effort.
Why? They can clearly profit while there's a need for the service they offer.