Getting to fall2016 without some really decent content is going to be a hard sell. I'm wrapping up TTK now on all 3 character and if a few time gated lackluster exotics are all the await me going forward I'm not going to be too pleased.
It's another large problem that they have effectively destroyed any desire to play year 1 content again by removing them from the current strike playlist (other than legacy) and having the other 2 raids have no worthwhile drops to anyone above level 36 beyond a item here or there to unlock another mediocre exotic
Yeah I'm a pretty slow player, almost exclusively weekends, and I've managed to level up 3 characters to 280 - 290 light since early October. I've done pretty much everything except the raids. Even at my slow pace there's not enough content to keep me engaged for the next 10 months. Let alone for someone who plays Destiny on a daily basis. Games like this need a constant infusion of new activities and new loot or they'll fade.
The larger issue, though, is the number of unaddressed problems in the current game. For example: the Shadowshot glitch (a Hunter super that can be glitched for infinite uses, for those unfamiliar) was temporarily worked-around by disabling the subclass perk called Quiver. It's been weeks and Quiver is still broken. Furthermore, there have been some bad problems with PvP matchmaking (being matched into games that are completely one-sided, being matched in as the only member of one team vs. 6 people on the other team, etc) that have remained unaddressed since Destiny came out.