I think that the greatest obstacle to a definite interpretation is that we really don't know what it means when we say that a quantum state is a vector in a Hilbert space, and that an observable is an operator on those states. We know how to treat these objects mathematically. We know all the rules, and so we can derive principles from them, such as the Heisenberg Uncertainty principle or the spin-statistics theorem, make calculations and verify those with experiment. But we haven't come to terms in what those are vis-a-vis the wave/particle nature. We have a probability theory but can't figure out if this is due to epistomology(lack of knowledge of the system) or is it ontology( some intrinsic nature that can't be reduced to known quantities). Even though a good number of responders in that survey are willing to say that Einstein was wrong, I'm not sure if that is true. I thought so when I was studying this stuff as an undergraduate. However, after years of teaching this material, i'm not so sure if the great one has been well understood, and most likely was badly misjudged. As I'm getting older :-D, I tend to be more understanding of Einstein's position.