I can see it already...
TSA bans the carrying of batteries over a certain size (size is their "see, we thought this through and want to be reasonable" argument). They'll release a special video on YouTube showing exactly how big an explosion they can get from a common laptop battery, and the masses will be in awe that they ever boarded a plane with such a disaster waiting to happen. Mystbusters will also film an episode where they Confirm the "Exploding Laptop Battery" myth... the episode will when a laptop battery they stuffed with 11 pounds of C4, rolled in a coating of thermite, and dipped in ball bearings is used to destroy 4 decomissioned planes somewhere in the middle of the desert.
This ban will affect laptops, portable game systems, video players, etc... the things you actually use during the flight. You'll have to remove your battery at the ticket counter, and your airline will give it to TSA to put in a special fireproof container for the duration of the flight.
The airlines come in and say "We're on your side, travellers" and begin to retrofit planes with power outlets at the seats. Ticket prices will increase slightly to help cover this retrofitting on behalf of all travellers.
Of course, 110v will be "too dangerous" and 12V cigarette lighters will be "too big to fit", even though both would allow you to use things you probably already have in your laptop bag.
Instead, they fit the planes with 8.23 V outlets which require a special 103, 72, or 45.8 degree angle doohicky (depending on the aircraft manufacturer) with three and a half prongs, which is now the special "Saf-T-FlitePower" plug. You can buy cheap throwaway adapters on each flight for something like $25 (these fall into 23 pieces or short out after 3 uses), and travel accessory companies will start selling slightly better made adapters for $75-$150. Dell will add one to your laptop for $250 if you check the correct box on the 8th tab while building it online, but it's ok, because 67% of the time the box will magically be checked by default (people who didn't mean to get one will wonder WTF this this with 3.5 plugs is when they open their UPS box and it will ride around in their laptop bag unused for 4 years).
Now, when you're on the plane, your outlet will be disabled, and it will take the flight attendant typing in a special code with your seat number to turn it on. You can buy one of these codes with your ticket, or may get one automatically if you purchase a certain fare class, and the reason for the whole thing is to cover the cost of the retrofitting (nevermind that they already increased the base cost of the ticket to help cover this, and the functionality which allows them to turn off individual outlets quadrupled the cost of the retrofit in the first place). Also, please be patient while the flight attendant enters your code... for safety reasons this has to be done after reaching cruising altitude, so on some flights you may be halfway through the flight before you even get power. (No kidding, if you've ever been on Frontier and gotten a DirecTV access code).
Once you get off the plane, you'll travel down to the baggage claim, where an avalanche of special fireproof containers will come tumbling down the little ramp. Have fun sorting them out with everyone else on the flight who had to check their battery.
Of course, those of us who don't check bags (I haven't checked a bag in over 10 years and fly 4 segments a week), will just be screwed, but luckily the SkyMall catalog will start selling a cool new device which allows you to pedal up some power for your laptop while in flight! (Eventually, there will be alternatives, such as The Wind Powered Laptop Energy Device" you attach to the overhead air duct, and The Solar Laptop Power Supply which you suction cup to your window and hope you have an AM flight with a starboard window seat on a flight headed due north.)