The demand is high and I think it's great to have more options without plastic. Personally, I'd like to see more R&D on existing plastics and development of new compounds that retain the weight, durability, and heat retention properties of plastic but that are shown to be safe and have no evidence of leached compounds or risks of microabrasions. Also, from a cost standpoint, I don't think there's any reason to avoid plastics in these devices that are not coming in direct contact with coffee / heated water.