Number 4 - a little bit of a grind is heading a lot down the wrong road, for a number of reasons. First, the grind itself functions as a
dual-purpose time sink: it gives the players
something to do when they don't have time for some of the more intense content (which admittedly, is yet to come) and it also gives the developers time to, you know, develop while the players continue playing.
Now you can
disapprove of the forced time sink, but it's the nature of the beast in any RPG, and MMOs certainly not the least. Moreover, if you're talking of these sidequests/leves/"self-motivated content" (a vague-sounding term) as "supplements," then you're acknowledging the necessary primacy of the grind, making it more than just "a little bit." Lastly, you make the assumption that players feel "pressured" into doing leves because it is the most efficient use of time. Be that as it may, players will always look for the most efficient use of time when it comes to advancing their character. If the other activities are supplementary, then they'll not be turned to for the purposes of efficient time use. Nobody is forcing you to do the leves; they're just the grind with more concrete rewards.