^^^
I doubt that there will be another format in 2 years for mass mainstream consumers. There maybe much higher storage capacity format in 2 years, but those are usually for industries and businesses that need them since they could be quite expensive.
it should be longer than 2 years when there is another format available that is aiming to replace Blu Ray in the future. I say in maybe 3 to 5 years from now is when we will start to hear formats that are announce in prototype that might compete with each other to be the next format that will replace Blu Ray. And that format won\'t be available to consumer yet until another 1 to 3 years afterward for fine tuning, giving it the finishing touches, and in mass production.
After this format war where it seems like Blu Ray will be winning, I think next generation will probably have one standard format where all companies agree to join like how the dvd was, because launching multiple formats from different companies can confuse consumers, and consumers not supporting them and a lot of money will be lose for the failing format from R&D, advertisements, selling it cheaper than production cost to lure buyers, etc...HD-DVD is a good example of this.