While I do approve of the intetion of that suggestion, the solution itself is not a good one.
First of all: many veteran players complain about the game not being deadly enough, and I agree on that. It used to be a lot deadlier some time ago. While it is always smart to think of the newbies, you also have to keep the veteran players motivated. Your suggestion would piss them all off, and they are in the majority after all.
Then: your suggestion would not help at all. If anything, it would make things worse. Because if a noob can block only like 25% of all hits, the amount of the hits would not change anything. It's not like noobs have problems blocking the first hits and then somehow magically warm up and get better. In this case your suggestion would help. But in its current shape, your suggestion would only lead to less "lucky kills", which would move the results of the fights closer to the statistic middle, which again would mean, that the expectable outcome (= veteran wins) would appear even more often.
It's okay the way it is. You know, "difficult game" can be a selling attribute. Just look what is said about Tribes: Ascend, Dark Souls or Dwarf Fortress! The last game even has incredibly awful graphics, but people still love to play it, and part of that motivation is the difficulty! If people don't like it, it's simply not their game.