>From the vendor side, if they make their money from one-off licenses, the economics just don’t pan out over the long term. The incentives become for them to spend all their energy on endlessly expanding market share so they can sell to new users, and/or churning out paid upgrades and add-ons to sell to their existing buyers. There is no financial incentive to work on code quality, bug fixes, or other sustainability considerations.

This is pretty telling that the author can only imagine a business model where one makes a single product and collects rent on it for eternity. The "long term economics" of selling products is that you then go on to make other products and make money on them.