I like the way ST is. While it's not really difficult, it does provide some 'ohshit' moments (mainly Scylla, for me).
I don't think it needs to be changed.
It just seems easy now that everyone's overgeared for it and ran it a million times. But there will always be that flow of people (even if in the minority) that haven't run it and aren't over-geared yet. It's a fine stepping stone into harder content and future raids.
Besides, they're adding more to the Crystal Tower storyline it seems - thus more raids with most likely greater difficulty.
