Stock buybacks are the same thing financially as a corporation issuing dividends except that with a buyback, the holder isn't forced to take a taxable event. It's almost always better for the owners to receive buybacks rather than dividends, especially if the owners pay income taxes.
Returning money to shareholders is much better than pissing it away on whimsical experiments because the market is a better investor than some exec board at a company sitting on cash.
But birth rates are low, so demand is going to be depressed for many decades to come. So we will need something, either fiscal stimulus or QE.
By the way, when I say birth rates are low, I'm very much including China. The one child policy has global effects. World wide interest rates would be wildly higher if Chinese families had continued to have 4 to 5 children, which is that they were having right before the imposition of the one child policy. It's because China has so few children that they have so much savings, leading to the global savings glut that has given us interest rates near 0%.
So much different outcome for US with large trade deficit and ever growing fiscal deficits. Some argue if we did go the route of Fed monetizing (which almost certainly has to happen) the $ will be value much lower than it is today. This would help to close the trade deficit though, and repatriate some lost industrial capacity, boosting exports.
https://www.businessinsider.com/qe-in-the-financial-crisis-o...
Best laid plans and all that, but there's no point worrying about a theoretical boogie man.