That might be a good idea. However, for some museums such as ours, which is located in a slightly more remote region, relations with other museums are somewhat limited. There are a few in the region, but not many. There might be less interest in this kind of passport among people in the area than among people in the major centres, where it might be a good option, but it would have slightly more mixed success in the regions.
On April 26th, 2012. See this statement in context.