No more sunrise surprise: will an umbrella clearinghouse appease trademark owners?

If there is one thing that trademark owners resent more than having to validate their registrations during the sunrise period of a new domain launch, it's having to do it countless times under different policies. The forthcoming introduction of hundreds of new generic top-level domains (gTLDs) will compound the problem – but could plans for an umbrella clearinghouse save brand owners a major headache?