Every individual tool is experimental and essentially provides a proof of concept. The implication is that once a tool has proven itself, it could go to a next level and gain all the trappings of a production service.
Criteria for the tools that deserve to be upgraded to production quality are:
- the service it provides is being relied upon
- the service can be of value to an international public
- it stimulates the use of the Wikimedia projects by new demographies
As these tools are freely licensed, it must be possible to either fork the code or preferably work with the primary developer to provide the service that the concept hints at.
When you consider the size of the Toolserver server park, it is not a project that can be dismissed as "Spielerei".