The individual in the video obviously has a strong bias in grappling/BJJ.
The disadvantages to grappling on the ground far out weigh the advantages. I agree one should train in some sort of grappling to defend one's self in the chance they are taken to the ground. However:
What the video lacks is that many stand up arts have grappling/throws/arm-wrist locks, and control techniques that do not require one to go to the ground. I am always suprised that there are not more stand up arm bars and wrist locks performed in MMA competitions (admit my lack of knowledge associated with MMA/UFC rules).
He also does not address the legal ramifications of choking someone out on the street. Once the adreneline starts to flow, everything get more explosive. If you accidently kill someone or use "excessive" force (determined by a court and 12 people not at the scene of the altercation), the one defending could be the one to go to jail.