I think the reason we're getting less quests is because Jagex is focusing on the Elder God and Young Gods' quest series, whereas in previous years there were no World Events, no Elder God Crises, no God Wars etc. (you get the point).
Jagex created the PTTP polls and the majority of players decided they wanted to focus on the Elder God series. Graphical updates, new lore, new areas and environments, reworks of existing quests, new minigames, the Invention skill, elf city and many others, take up a lot of time.
02-Jul-2014 09:56:41