You will get tip losses from this. Sounds as if it was from the cold end, in which case, possibly not as much thrust at altitude and high temperatures. Below its when a fadec is limiting against max thrust limits, it wont make much of a difference (although fuel consumption will be up slightly). If it is caused by acoustics from the othjer failed components, it may be less of an issue as long as they can beef up the non-rociprocating parts and take a slight weight penalty or slightly mod the design. It gets expensive when you mod bits that start to spin round.
If they are making out that a full blade mod at this stage is going to be cheap, they are talking hoop. Any single element in a gas turbine modded can lead to vibs problems in other areas. Its one great big balancing act I am afraid.