Unfortunately, irrespective of the 'once in a lifetime possibility of ice build up after a long, high altitude trans-Siberian cold soak transit that neither Boeing nor RR could have foreseen' one has to ask, what's the problem with the RR 777?
That would be akin to saying lets ground the 737 fleet due to the remote possibility of the consequences of a rad alt failure not being noticed by a three man crew.
Now that the consequences are in the open, an SOP exists to ensure correct engine response during descent and a mechanical fix is on the way, you still think they should be grounded?
A little knowledge is a dangerous thing.
[edit]
Damn! Over use of the
smiley
