He's not saying they would trade 16 and 19. Mostly likely 49 and 16 to move up to around 10. That's really not a terrible price if they think the LT they are targeting can be their starting LT for the next 10 years.
Personally, I'd rather stay put and get a guy in the 2nd or 3rd that can develop under Hurst who I think is solid. But, if the Saints think that Hurst can't do the job I could understand moving up with 16 and 49. I could not understand moving up with 16 an 19.