They won't compete on salary, there's probably plenty of talented people who simply do not want to live in the US due to the work culture, especially French workers. 35 hour work week with 6 weeks of paid vacation is worth a lot I imagine.
So they'll have to pay a premium for them.
They dont have to do anything, they already got the money :) and will get sweet government/eu contracts/grants no matter what for at least couple of years.