Eh - there is actually plenty of room for pretty much all the trash humanity could possibly create. A hole ten miles square and couple of hundred feet deep could hold all of the U.S.'s trash for the next 100 years (this is not a controversial statement). And recycling is energy inefficient for pretty much everything but aluminum and steel.
Keurig solved a huge problem in offices - how to always have coffee available when people en masse are pretty bad at refilling the coffee. No amount of hand wringing will make people better at things like refilling coffee.
Like space, energy is also a non-argument, there's plenty of it.
The thing we don't have is infinite petroleum resources to make single use plastic cups. The other thing we don't need is unnecessary amounts of toxic production polluting the air, water, and land far and wide outside the hole in the ground where the waste goes.
Keurig solved a huge problem in offices - how to always have coffee available when people en masse are pretty bad at refilling the coffee. No amount of hand wringing will make people better at things like refilling coffee.