Yes, but again you're talking about 3-4% nominal GDP growth not real growth (which will be less due to inflation).
If you want to pay for something using nominal growth you have to also accept the nominal growth in the cost. So in 20 years you will be able to fund 15,930 per year but that won't be enough anymore because that number will have risen.
If you want to pay for something using nominal growth you have to also accept the nominal growth in the cost. So in 20 years you will be able to fund 15,930 per year but that won't be enough anymore because that number will have risen.