No one is arguing to drop the storyline entirely - just trim it out a bit. They could get rid of 50% (maybe more) that is just fluff and everyone would still know what was going on when they hit heavensward.
Try this exercise. Try to remember all the quests you did for the MSQ. How many can you remember? Here's the answer: the 50% of the impactful ones that moved the story along. There are 346 quests in the main storyline and I will not believe anyone (aside eidetic memory) who says they remember every single one of them. They added filler for grind purposes and artificially inflate time it takes to complete, but now we are in new xpac - for what reason hold on to the old?
