Unless everyone starts building them tomorrow, I wouldn't worry too much. Commitments from these events are mostly empty promises, so if wind and solar are looking that much cheaper in five years, I'm sure they'd switch.
Part of the game will be to get other countries to sign contracts with the supplier before that realisation hits. They'll have decades of construction and further decades of expensive power to regret their decision by which time the sales team will have long retired.
That kind of corruption is common even when the person selling the dream is getting money from their own country's people. It steps up a gear when you are selling the dream to other nations.
