No, traditional flashlights will not be obsolete in 2020 or 2030. What we will have by 2020 are single AA lights capable of outputs in the 500 lumen range off ni-mh and 200 lumens for 5-6 hours. Lights that run on 8 AA's like the TK41 will output probably 3,000+ lumens for a couple of hours, 1,000 lumens for half a day, 100 lumens for a week, and 10 lumens for 6 months.
The big hitters such as lights like the TK70/Olight SR90 will output 10,000 lumens and have a throw reserved now only for big HID lights.
When you consider I've only been a member of CPF for around two years, the lights and advancements in led technology since then have been amazing, and will only continue so in the future. Two years ago XR-E lights were still popular, also the XP-E, then the XP-G was making it in to the flashlight world and the mighty MC-E and SSC P7 were king.
Also, can you get high CRI nightvision?