This loss has been in the pipeline for a while now; you can't pull a financial side-step to avoid having to fix a large fleet of in-service engines, they have to be fixed.
Assuming Rolls survives this (seems a safe bet), what will RR look like after all this is done? Poorer, certainly. But fitter? Lots of lessons learned? Expanded production / engineering facilities stood up in order to cope with the extra work? Dunno, but if they did then those might come in handy if they did get back into the small / medium sized engine game again. RR's Advance and Ultrafan look like they're pretty good, so it seems likely that their long term health should be OK. Provided they learn the lessons of this episode.
It's a bit like P&W and their travails with the GTF. We all know that once they've got that right, P&W will be minting it for a long time to come, so the current woes are worth riding out.
Concrete engines - reminds me of the Blue Circle* series of radar sets for RN / RAF aircraft. You know you've got delays when you get a second Mark of concrete radar (i.e. it's had to be upgraded).
*For non-UK readers, Blue Circle is a brand of cement here in the UK.