Hmmm, don't know where you get the idea of even the possibility of grounding the RR 777's? Rolls Royce has a new part on the way, there are 'top of drop procedures' in place to prevent ice build up and, even if there was discovered to be a constant, tenable risk on long, high cold soak sectors then the RR777 could be re routed off those sectors.
It's all doom and gloom in the world without inventing new bits!
If I were in GE marketing I would be baying from the highest hill top to get the rollers grounded, but that would just be marketing.
Interesting, times ahead as business plans and cost saving procedures get resolved and announce I think we will hear more, until then you just have to keep treading water!
Good luck