This is the tradeoff... SaaS gets great margins because it's not custom. There's a high fixed cost, then each incremental addition has benefit. Even with a low marginal cost this is true. The #1 SaaS can also add lot of features and increase reliability and spend more on Marketing. You could argue that Wal-mart is a commodity too. It's just stores and the same stuff as K-mart and 7-11. But it crushes them. There's ro…
And at the same time, all these services are, as the article points out, becoming commodified. Thus, recognizing that they really can't make money in the SMB market with such low switching costs, they decide to move to the enterprise market and thus the whole economics of SaaS are blown up, and they look very much like a traditional enterprise software business - and SaaS becomes a delivery methodology rather than business model.
My own article on this issue (shameless plug): https://medium.com/i-m-h-o/a2cc0d5ba431