Pollsters have a hard time predicting, because they don't actually do forecasting. All they do is report the results of 1,000 people and what they said. Very little analysis actually goes into it in terms of creating forecasting algorithms or anything prospective. That's one of the reasons polling has become drastically inaccurate in a lot of places.
In terms of the impacts of targeting, it absolutely could affect the results of an election 10 days out. That's not necessarily a bad thing, but more parties and political actors should be looking at that problem and at ways they can engage people on digital platforms. More turnout is a good thing.