Currently living in Bangkok and it's already quite noticeable the changes since mid-2015 when I was last here. Sukhumvit Road, one of the main streets, has a fraction of the street vendors today compared to 2015. The further away you get from the popular/touristy parts of town, the less affected it is. However, between these recent changes and the ever increasing number of lots being turned into construction sites for new condos, Bangkok is rapidly changing and its famous street food scene is suffering.