This is quite exciting in that it removes plastic waste. I see no reason why different companies can’t make different shape ones to maintain their lock-in. I expect a knock-off market to pop-up, but that exists with plastic pods too. It’s a step in the right direction at least.
I’ve got two: One Keurig which was a gift and an off-brand single-cup coffee maker that uses pods. I’m the only coffee drinker in the house, so one cup at a time is about right (and uses less energy than keeping a carafe warm all morning).