I completely agree. However I think there is also plenty of room for improvement in the ETL process that doesn't necessarily mean a one-stop solution.

For example, the common denominator data format for many use cases (not all) is a relational database. Why isn't there something that can grab data from anywhere in any common format and import it into a relational database with only a couple commands or mouse clicks? Right now the situation is that you either have to pay a lot of money for such a tool which usually doesn't work very well or you piece together the various data conversion tools with scripts. There is of course a lot of other steps in the ETL process, but that alone would save a lot of time.