The Next Technology after Blu-ray -or- Is Blu-ray Here to Stay?

Blu-Ray has now become the physical media format of the future. But is the future of Blu-Ray in jeopardy already? Some say it is the case, and certainly there are two credible threats. The future of Blu-Ray will depend on the future of these alternative formats, but those who just bought Blu-Ray shouldn't worry too much. Blu-Ray will be the best HD media format at least for the next few years.