Freebase doesn't have an ontology in the Semantic Web sense. It's always been a specialized tool with non standard protocols like MQL. Schema.org is somewhat related but not tied whatsoever to Freebase.
Wikidata is fully editable and has an ecosystem for updating data so concerns about stale data aren't valid. Since Wikipedia will be pulling from it (is already in some cases) you could argue that their will be more sunlight on the data.
There's been a lot of code written against Freebase APIs (me included) but it isn't sad it's going away. It's the risk you take when relying on 3rd party services. I think your confusing short term developer convenience with a real loss of open data.
Wikidata is fully editable and has an ecosystem for updating data so concerns about stale data aren't valid. Since Wikipedia will be pulling from it (is already in some cases) you could argue that their will be more sunlight on the data.
There's been a lot of code written against Freebase APIs (me included) but it isn't sad it's going away. It's the risk you take when relying on 3rd party services. I think your confusing short term developer convenience with a real loss of open data.