Have to give credit where it's due. Great concept, hope it's implemented well. I would love to carry a normal sized phone in my pocket, then flip it open to watch a movie or read a book.
But that's the hard part... making it normal sized.
Foldable displays could work well if they can get it to actually fold flat and/or make phones much thinner.
The devil is in the details. A lot of companies are working on foldable displays, including Apple. Samsung, with its display manufacturing skills has as good of a chance as any, but let's face it... They don't exactly have a good track record of introducing something new that was well thought out and well-executed.
They like to rush things to market to say they were first.