It's only about 1-3 hours of playtime right now to get a level 28 character to 30 or above (without using any of the DLC content - legendary armor is dropping plentifully and is easy to buy at the tower using marks from strikes or crucible, and exotics can come at +42 light if you buy a new one from Xur on the weekend). Not anywhere near on the same level as regrinding exotics after upgrading them through Xur in TDB.
I think they should be made available for all year one players regardless of level. That's more about a principle though, as I'm unlikely to go back to the game. The 1st DLC splitted our group, as you couldn't participate in the same weekly missions. Those who kept on playing are leveled far higher than those who didn't, and based on the posts in our FB group, some of them are now moving to other games as well.
I might return to it, if the additional content would get a significant price drop at some point, but I think that's very unlikely to happen, considering that DLCs rarily get cheaper. I really don't want to pay premium price for few little story missions, when raids are nearly useless to me due to the lack of matchmaking. It's just a pain in the ass to arrange gaming schedules for them.
On a side note, it would be interesting to know the price and playing time ratio between the main game's campaign, the 1st and 2nd DLC, and the upcoming larger one. I wonder if the campaign length of the Taken King is in correlation to the price tag?
You quit? Good. Glad they aren't rewarding quitters.
Are we back in kindergarten now?