There is a rumour that existing holders will be allowed to continue to use the rating for their lifetime. I am not sure how that will work if the infrastructure for teaching the IMCR to new pilots disappears. Who will then revalidate the rating?
There are also rumours that EASA's FCL proposals have received the EU equivalent of a good kicking from the Commission and that any vote has been put off to at least December, so reports of the death of the IMCR may be premature.