In particular, we have to weigh this cost against that of making an effort to invest in pre-empting the failure of the system in the very first place. The SDR, for instance, is not a cure-all for the international monetary system.
The crux of the system is not the international use of national currencies, but the myopic use of domestic policies for achieving short-term gain at the cost of long-run pain. Assigning a more prominent role to the SDR by increasing allocations would hence by no means prevent the build-up of excessive reserves in countries which accumulate them for reasons beyond precautionary motives.