That is a legit concern. Hopefully, they engineer these scooters to be more durable over time. Also, hopefully user etiquette improves over time as well so people abuse these scooters less, resulting in far longer life spans.
I think if anything the etiquette will get worse. I've already heard of people throwing bunches of them in dumpsters, then when the dumpster is picked up and compacted the batteries catch fire setting the entire load of garbage on fire.