Lisbon Treaty obliges Union countries to develop a uniform immigration policy. I believe immigration would increase as a result of the Lisbon Treaty because the process would become more streamlined. It will also become easier for a person to move between member countries, and for families to re-unite in one country.
No, the Lisbon treaty would not increase immigration within the European Union, because there is already open immigration within the European Union. Young people in Europe often move around to where they can find jobs. They do not need to wait for the Lisbon treaty to pass in order to be able to do this. The Lisbon treaty won't make a difference in this respect.