a1. Unfair to the newbie that came to this forum for knowledge and possible earn. Those guys who have been earlier were not required to have this to ranked up.
It is quite obvious that what you are saying is true, newbies are really the most affected by this but it is only the normal thing whenever there is a change next group is always prone by the effect whether it is good or bad. But I think there is no reason to make ourselves worry, just be responsible to obey the rule, I believe when you do this merit sources is subject to do their task.
2. How will you that merits are given only to those with quality post?
What are you trying to say?
"How will you know.....?" I think merit will surely do their duty fairly but not the spammers.Just try to have some trust with them and let us see the next thing for this merit system.