I actually disagree with you simply because i have seen Tungsten as a ring before. It was not brittle in the slightest, or if it was, the fact that my dad (the owner of the ring) hit it with a hammer was not enough to overcome the toughness part of it. If memory suits me right not only is Tungsten the hardest metal on the Vickers hardness scale (although not Mohs), it is also like the second toughest, meaning that it is very resistant to shearing, snapping, and that sort of thing. Granted I could be remembering wrong, but I would like to hope that my reading on the element stuck.
Either way yes a Tungsten yoyo would 100% be a wrecking ball