I therefore assume you are wondering whether to carry on with another year of Economics?
A degree of any kind won't make much difference with regard to a CPL or any other licence (unless your future employer wants one for some reason) but it may serve you in later life when you want to move into management, or when your passengers have degrees and won't otherwise listen to you - I guess that depends if you are going into bush or airline flying.
On that basis, 3, years, 4 years, who cares?