I didn't watch the clip (unable to access youtube videos at office). Singapore is unlikely to legalize pot, but I see the possibility of the weed being decriminalized if the present legal status of marijuana takes shape across North America. Currently, I think two states in the US allow recreational pot use, with many more allowing it for medical, and is set to grow. The public there has more or less accepted pot as harmless and the new generation sees it use as a mainstream activity. Singapore does not have a ganja industry and will not profit from it, but once it is openly used elsewhere in the world, as global city, Singapore will have to loosen the legal noose on pot and close an eye to consumption. So, legalization no, but decriminalization, possible. However, do not go rushing to get your stash yet, by all accounts, it is still classified as an illegal contraband now. Get caught for pot, you get thrown in jail.
Cheers!