The big question is, if customers are going to stay over a long run. Also the assumption is that SAAS companies are to keep growing, while I see them all converging on the same market / same dollar spend (CRM, Support, Workflow). There will be consolidation at some point, and it won't be pretty.
> The big question is, if customers are going to stay over a long run.
Plenty of public companies have had several years in a row of >100% net retention. When Dropbox filed its S-1 it had a graph showing that every quarterly cohort of customers who had signed up had continued to grow massively in value over time, and i imagine the majority of successful SaaS co's could show a similar chart.