If physical waste is not a real issue, why do I see garbage on the ground? Why is there tons of plastic in our oceans? I think there's more to the issue of physical waste than whether or not we can dig a hole big enough for it all.
We're not concerned about whether we can bury it in the ground.
You should take a calm look into the carbon and ecological cost of producing and reusing the reusable equivalents of those single-use products.
Besides... If you have any idea on how to make it possible that people not dig every gram of fossil fuels available and use it for something (that something being a piece of plastic buried somewhere being way better than carbon dioxide at the atmosphere), please say so, because natural gas based plastics aren't a world-ending problem, but the coal mining endgame is.