I support this idea because:
- It's more consistent with the basic MW API.
- It will allow to create more powerful queries using generators
A detail: Wikidata doesn't use the interwiki system for identifying websites. So, I don't know if it's possible to get the item related to "w:en:Application programming interface" in this format. I think that we will have to keep the sites/titles couple of parameters. So we would have a gwdsites=enwiki&gwdtitles=Application_programming_interface. This will make also this new API compatible with the old one with only a change of parameters name.