So what's the long term policy / law that will come out of Ebola testing via the TSA? Since these activities never go away they just become unquestionable policy.
Long term maybe it's finger print scanning, blood, saliva.
Those agencies both have wider mandates, so they won't want to continue to expend resources on pointless screening. Much of the criticism of the TSA is rooted in the fact that it exists to expend resources on screening (maybe with some arguing about whether 'pointless' belongs in the statement).