Not surprisingly, there have been many attempts to cultivate culinary truffles, and at least some species are now being commercially produced – the truffle fungus is a mycorrhizal symbiont of various trees, and by infecting seedlings of the appropriate trees with the fungus, it is possible to produce truffle plantations.
To return to the potoroos, the truffle species they use are as far as I know not used in cookery, but are extremely important to the ecosystem. The reason they produce scents which attract the potoroos is that they spread the spores of the fungus in their droppings, just as berry bearing plants use birds to spread their seeds. An absence of potoroos could thus have serious long term consequences for their habitats, as in the nutrient poor soils of Australia mycorrhizal fungi are particularly important for nutrient uptake by native plants. Other than fungi, potoroos feed on some plant material and will also eat invertebrates. This more generalist diet led some fossil potoroos in a predatory direction – Propleopus was a 70kg creature that seemed to have had an omnivorous diet and was certainly capable of eating meat.
Outside Australia, the only species of Potoridae that can be seen in zoos are the Long Nosed Potoroo and its relative the Brush-Tailed Bettong. The only Long-Nosed Potoroos in the US are at the Kangaroo Conservation centre in Georgia. Bettongs can be seen in both US and European zoos.
(images from wikipedia)