On the marks thing, I personally don't play Destiny for the loot grind, in fact the loot grind is probably the worst part of this fucking game, I just want to get my gear quick and then focus on the end game stuff until the next expansion. This is why I loved the progression in HoW, I could just play the game for a short time and save up marks to go and buy all the vendor armour I wanted with the perfect stats and perks, ascend it and then use it in PoE and ToO, I didn't need to pray to RNGeus for the perfect drops because I could just buy the shit.
If Bungie want to make us rely on random drops to get the gear we want by neutering the amount of marks we can get than fuck that noise, I don't see them increasing the drop rates enough to compensate for not being able to just buy what we want, not with all the stat and perks combinations that is possible to get on gear, you would need to be one lucky motherfucker for it to work in your favour.
No, this would be a massive regression on Bungie's part and I for one don't believe they'll do that, not after all the talk they've made about not wanting to make Destiny a second job for people. They've been making this game more and more casual friendly with each passing expansion and I think they'll continue with that.