Escalating construction costs under FIDIC: is Sub-Clause 13.8 an answer?

Construction costs are escalating. Under existing contracts, an employer will not want to pay more for the works. But forcing a contractor to perform works that are unprofitable or causing a massive loss is unlikely to be in the best interests of the project. It may result in the insolvency of the contractor forcing the employer to abandon the contract or re-let it, probably at a premium. Is a mechanism for cost adjustment, such as FIDIC 1999 Sub-Clause 13.8 [Adjustments for Changes in Costs], an answer?