The problem is, is that the hypothesis is not always wrong. There are many examples in history where new hypotheses came along which go against the generally accepted dogma of the relevant field which scientists try to squash.

Think about it this way: if a hypothesis comes along which is counter to the work you've been doing for god knows how many years, are you really going to agree with it (publicly). This new idea threatens your career, so you do everything possible to get rid of it. The new system tries to keep around these new ideas so that they can be evaluated multiple times, as the people doing the evaluation change.