You can merchant and manipulate the market on a level 3 without any ingame skills, nor having to do any of the tasks this game originally was meant to offer. However you cant successfully stake on a level 3 and manipulate the whole market on the same basis as merchanters if you're not a high level. Both merchanting and staking requires mental skill to be successfull in so I don't think there's a possibility the new market update won't ruin merchanting in some way. On a side note, pc split update was the best update thus far, not the worst.
Merchanting takes no ingame skill while staking requires training certain combat skills. I'd be really surprised if jagex DIDN'T destroy merchanting even more than they destroyed staking. I think the cap should be raised to around 1m/h to be fair with the stakers, although I'm not affected by it in any means and neither will I be affected by the merchanting update.
Of course people wouldn't exact follow the rules, but knowing you're in a world where the majority of people are similar in age would be good. I'm 16, I just want a more mature world to play in. You say you're very mature yet you've had an offensive signature, quite a conflict there.
Says the guy with an account called "panda pants1". Seriously, noobs shouldn't flame. On topic: the Jack'o lantern mask wasn't a big surprise and many expected it but quite a coincidence still.