For people who only have few exams (only A2 or AS) it will be positive because they don't have to revise much while other people who do 1 year a level will be under pressure!, so it's negative for them
about the boudaries I think it will be lower since many exams will be closer to each other. I have 10 exams in this summer C3,C4,D1,S1 and 3 in media and 4 in business studies. I have start revised and done past papers since february, so pretty confident about its, although sometimes i got silly mistakes but I think I can solve it out from now to the summer.
The chance of getting higher boudaries is not high because many people will get 2 exams in one day and may be 6 7 in a week :-ss. Unless you start revise early or have extremely good memory, you will not see this exam got so much opportunities to get high grade. Hard working is the key!!! Personally! I dont think many english student will think it is positive effect! I'm Asian