No. If you read what I said, I said that once you have
completed an area there is no incentive to go back.
The dynamic quests are pointless at high level in a low level area, you get about 300 karma, few hundred xp, and some copper, yay. Worth spending time on. And the loot you receive will be vendor trash low level items.
When you get to high level the incentive to play is to grind prestige armour via dungeons or karma via high level event chains. Not to go back to the Grove and kill fireflies for 10mins for 200 karma and 10 coppers.
Obviously its good to go back to help your friends through the game, but as it stands GW2 doesn't really make you want to do this as currently your friend could quite easily get through everywhere on their own without any help, you being there doesn't really speed anything up, you can't help them fill their heart faster etc. So basically you kind of hang around in your pimp lv80 gear looking cool and cheering them on as they kill some lv5 trolls, when you could be off doing high level content earning piles of gold and karma in the same amount of time.
NOW, if they made low level events SCALE with character level, THEN it would be worth going back to help people, and it would get high level characters back into the starting areas.
If they made it so say for example:
Help Plantlady collect Firefly essences!
Level 1 guy might get 300karma 500xp 50c
Level 40 guy might get 600karma 1500xp 1s
Level 80 guy might get 1200karma 3000xp 2s
Then while its not as profitable as doing quests in Orr, it's still worth while helping in early places, and much easier to achieve than the big high level chain events.
Obviously it'd have to be balanced so that it wasn't faster to farm low level karma events than doing high level stuff, but they could certainly scale it to make it at least worth considering!
I mean even waypoints scale with level! Hell, it costs me over 2 silver just to warp to a low level area