'robust ecosystem' is correct and can be used in written English.
You can use it to refer to a diverse and complex network of biological and/or physical systems that are able to adapt and sustain under various conditions. Example sentence: "The rainforest is an incredibly robust ecosystem that supports a wide variety of plant and animal species."
For all the debate about which Web sites have the best model for reliable reviews — paid or unpaid, anonymous or real name, Angie's List or Yelp or TripAdvisor — one thing is certain: a robust ecosystem exists online for restaurant and hotel reviews that has changed those industries for the better.
And, a robust ecosystem for entrepreneurship fosters strong links between the public, private and voluntary sectors.
As ICONYC begins bringing Israeli startup companies into the city, they're joining a pretty robust ecosystem that pre-dates them.
The App Store has flourished thanks to a robust ecosystem that has allowed many companies, developers, and users to thrive.
Smartphones must have a solid set of native apps, which webOS has, but it then must have an even more robust ecosystem of 3rd party apps.
Now that the Switch is a success, Nintendo needs to maintain it by building and supporting a robust ecosystem of games.
The E.L.F., rooted in a philosophy of anarchist primitivism, dreams of peaceful leaderless tribes living in robust ecosystems.
Only Beijing and Berlin have reasonably robust ecosystems outside of the US.
And then there are several tablets priced well below the Surface that are also a lot better and feature far more robust ecosystems.
The problem is that few companies succeed at building robust ecosystems of products, because few consumers have enough brand affinity to purchase gear from a single consumer electronics manufacturer.
River networks due to the larger link-diameter than 2-D landscapes with the same domain are potentially more robust ecosystems, for example against invasion of invasive/exotic species and pathogens.
