Great points: my take.
Apple losing samsung effectively means Apple has to find suppliers for approximately 15 million panels. (if keeping with current supply).
Competitors, such as LG who currently made 12.5 million panels for Apple will have to increase their production more than two fold, up to 27.5 Million panels in order to keep up with Demand.
if LG and other panel makers cannot make up for the 15 million panels lost, Apple will have a shortage of Panels available for products, meaning Apple could see a decrease in overall volume of sales as they wont be able to provide enough panels for their devices.
Samsung will walk away with manufacturing capabilities of 15 million LCD panels. With this extra supply, Samsung can look to do multiple things, From selling their own to selling to other OEM's.
Because they can do so many panels at such high volume, without apple's artificially high profit margins, Price of TV's, Devices and such using these panels should in fact get even cheaper. Remember, as you produce more of something, cost per unit to produce eventually decreases. this is called Economies of scale
Laws of "Supply and Demand" should dictate, in the end, Apple products Demand will exceed supply, driving the Price to acquire up. Possibly a return to the old "Apple Tax" mentality and people choosing to go elsewhere because of either prohibitive costs, or very long production times.
Samsung panels which will be in high supply, will be closer to meeting demands, and thus be able to be offered at significant reduced costs to other vendors who can in turn sell their products much cheaper, with lower margins
(all speculation of course).
In the end, Samsung and Apple will be short term left looking to change business plans. Samsung looking to offload 15 million in high end LCD. production will be easier to accomplish in this market than Apple attempting to increase it's other vendors more than 2x their exsiting capabilities. (increasing production isn't cheap, requires huge infrastructure investment as well as R&D, training and ramp up time of all things involved).
In the long run, I really think this hurts Apple more than it hurts Samsung.