There is no problem, things will still be the same, if TTK take away light lvls, then we'll be 20, so? Doesn't matter, imo if they do that, enemies also will be nerfed in level, meaning all remain the same, equipment and weapons will have the same power. On the other hand, if light levels dissapear, all Guardians fall to level 20 again, and the rest of the game remaing equal, well, we will have to play missions and strikes again to reach level 40. Many will complain, other bunch will cry, and some others will laugh at the view of "you'll now earn your level ña ña ña", Because I haven't played that a lot, I see no problem, no matter what.

Which would be idiotic in my opinion. I'm sure bungie has thought of how they'll do it but I just don't think going down to 20 is what will happen. We know that those 8 story missions will get us to max level, 40. I don't think 8 mission would give enough xp to gain us 20 levels ASSUMING the progression is the same as it was to get to 20.