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DIY CO2 and alcohol byproducts

If I understand it correctly, the main reason the DIY CO2 systems stop 
working after a while is because the alcohol concentration in the 
mixture gets too high, and the yeast starts dying off.

Doesn't alcohol evaporate into air?

Would it be possible to just uncork the DIY system every week or so, 
let it evaporate, and then hook it back up? Has anybody done this, and 
if so, how long does it work before petering out?