In my opinion, the decrease of roleplay is mainly due to a lack of encouragement of new players to roleplay. Most new players are of the casual sort, they google MMORPG and find PlaneShift. Then, they do what they know from MMORPGs, gaining money, grinding and levelling. With guildhouses for sale, all guilds are only set upon acquiring one. Smelters want to smelt platinum. Fighters want to grow stronger. Though they can't do anything of these without money, this is why they need money. And not only little amount, but huge sums, as training is not free. Furthermore, if they eventually got the money, they need to train. But how do they train? They spend hours and hours doing the same action all over again. No time for roleplay, as many people have a limited amount of time available. No time for those little roleplays, they waste precious time. Large roleplays can be forgotten, as they are even more time consuming. And if a large scale roleplay happens, it is always the same players. GM Events don't count, as they attract some people like moths are attracted by the light.
I enjoyed roleplaying a merchant, and I did far better than many miners, as resources like gold were rare. People didn't have so much money to spend, and for me, roleplay was rewarding. Now, with platinum in game and stat based prices, I don't feel that roleplay brings me any further in merchandising. Of course, many people would be glad to roleplay with a trader, but it is only a handful, always the same. In my eyes, PlaneShift needs more tiny impulses for roleplay, as those make players interested in roleplay. Currently, PlaneShift is an egalitarian society, only counting the players. In an egalitarian society, were everyone can achieve the same things, they mostly do them on their own. Interdependance is needed, especially with risk and reward situations. If players can make their characters take a risk in order to achieve things, they are often willing to do it. But currently, there is nothing to reach with risks. A plot to become the leader of Hydlaa's official Tanning Guild for example would be a risk. In an egalitarian society, most are not interested in doing anything, as they can do things on their own. What is needed is a stimulating system that allows players to roleplay whatever they like. Currently, no player character will ever become vigesimi for example. A player run government might be totally chaotic, but it would at least give players some impulses to roleplay. The new players want exactly that, to become famous, strong, rich. If these aims require roleplay, they will learn roleplay. They adapt. However, becoming rich and powerful at the moment requires two things, money and training. New players tend to crowd with themselves, they feel appaled by the hardcore roleplayers. If you got a lot of people wanting to achieve exactly the same, they will eventually form an association.
I am positive that if these basic aims of a new player require roleplay, they will eventually roleplay. If mining was restricted, players would need to roleplay in order to get a license. Not with quests, as these are done alone most of the time, but through a player character that acts as an overseer of the mine, for example.