Not to mention the military use and mobile digital device screen covers.
these are the things I have found that will cause the use of large sapphire boules to accelerate.
the iphone 5 camera cover is sapphire
there are numerous luxury brand phones using sapphire screen windows
there is a $27k digital camera touting a sapphire lcd cover.
Sentiment: Strong Buy
Sapphire bridges, that would be a big market for sapphire.
LED lighting on bridges, see London Tower bridge