I think it's quite possible the next LM become Sienna based. 80-90% of the sales will be for China, and the size of the Sienna is not a problem at all since the larger GL8 could navigate most tight spaces. What dealers want has always been a GL8-size van not an Alphard rebadge. In fact the Alphard is too tall to fit in some underground parking lots making it less maneuverable than the Sienna.The new 2021 Sienna is superb. Makes me wonder what a Lexus version could be.
The Alphard LM only allows for a spacious 4-seat config, or a tight 7-seat config. What is requested is a spacious 6-seat config so business people don't have to bring another car to squeeze their aide into.