I used to think that way, but now I don't believe that the debt ever needs to be repaid by anyone's children. The public sector debt is basically just a record of net private sector liquid assets, and repaying it would amount to the private sector losing all of its liquidity, or having to replace it with private debt instead. That's basically what happened throughout the roaring '20s preceding the Great Depression, and I don't think it really ends up being a good move.