I agree that MERS (and enterovirus) are more concerning than ebola.
I can't imagine how you'd track the number of people coming from any given region. I mean, what if a hypothetical person from West Africa drove from Guinea to Senegal for work, flew from there to Italy for a vacation, took a train to France because they had family there they wanted to visit, then wrapped it all up by flying to the US for work. How would we ever know that they'd come from an infected area? What about connecting flights? Those can disguise the origins of travelers. It's just not doable in a world as large as ours.