[In the longer term] "structural impacts would take hold through the channels of capital, immigration and lower technical progress."
Source "The Economic Consequences of Brexit: A Taxing Decision."
According to the OECD, not only the UK but also other European economies would also hold back GDP in a BREXIT scenario and result in "heightened uncertainty" about the future of Europe. The OECD report points out to the fact that the UK economy prosperity had a significant contribution from the EU membership. In the last 42 years of European membership, the UK more than doubled the GDP per capita."Since 1973, when the UK joined the EU, UK GDP per capita doubled, increasing more than in other non-EU English speaking countries over the same period, including in the United States."
Source "The Economic Consequences of Brexit: A Taxing Decision."

