In a rather surprising news, Odakyu has announced that it will remove its two sets of 50000 VSE Romancecar trains from regular revenue service in the upcoming 2022 Spring timetable revision and will be officially retired by Fall 2023. The reason listed on the PDF is due to aging and difficulty in replacing its main components after having a combined 6 million km travelled between the two sets over the last 17 years.
https://www.odakyu.jp/news/o5oaa100000214su-att/o5oaa100000214t1.pdf