I think it would be a great idea if union elections were inclusive of non-member input. Especially management voting as they surely have a stake, but also any unorganized workers should be able to vote on the union's leadership. Of course there are little matters like minority protection and such to consider and on reflection, even though I support "Right to Work," I would not be comfortable at all with the idea and would find myself on the side of the unions in preventing such a thing.
The proposal to have open primaries is equally offensive and would be, in the case of New London, having an unorganized majority dictating terms to organized minorities. There is an easier way for them to do that, join a party.