I see your point and I agree. But I think people with time will start to see the merit system as something usual and will get used to sending merits to posts which deserve it.
Maybe trading merits can be an issue in the near future, but I think the advantage of the merit system can be much bigger in the long run. So I agree with the idea (even if my rank now is low and for me it would have been much easier ranking up in the old way!)

That is highly likely to happen being new member acting in old way will benefit oneself in the merit system because only the old member can give you sMerits, thus if you leave a constructive post/comment to some topic they might notice that you are
genuine and didn't want to shitpost your way up there.