I'm actually searching two types of documents (could be the same):
1) A synthesis about all the main gap/problems that make the physical realisation of a quantum computer actually infeasible.
2) Something more polemical that criticizes the point of view "quantum computers arrive soon! They will break the actual instantiation of RSA", and consider that there is no good reason to think there will be a quantum computer functional for cryptanalysis during this century.
I'm not sure of the existence of 2), but I met so many physicists who are skeptical about the optimistic projection (4000 qubits in one decade). Maybe people here have heard about a such document?