Anyone who thinks that there are 10,000 students over 450 needs to have their head checked. Look at the statistics from 2015 year-end report:
400 - 449 13,537
440 - 449 2,486
430 - 439 2,842
420 - 429 2,185
410 - 419 2,899
400 - 409 3,125
A resonable average for a well qualified graduate (bachelors degree, CLB 9, under 30) would get only around 432 CRS (pre Fall changes). According to the year-end report above, there were only 2,842 people in that band. Adding on the extra 30 bonus points would take them to 462, but not all of the people in that band would be Canadian educated students, so many won't get any bonus points. I can't possibly speculate on how many of them are international graduates with Canadian education, but since Minister McCallum's target is at least 40%, I think you can probably say that the figure is lower than 40% of that group being eligible for the 30 point bonus.
Still, I fully expect that if ITAs stay the same that there will be a modest increase in scores over the next few draws before it starts to fall as a result of fewer points being given for LMIAs. The news is very positive if you have a score of 400+ over the next 6 months in my view. Many people have ridiculed the guy in the CIC video, saying that ITAs will increase and score will drop. Everything he has said has happened - and his prediction was for sub 400 scores after the pre-EE backlog is dealt with.
I think it's very telling that CIC view scores of 400+ as "high human capital". The fact is that, with these changes, they have put a massive emphasis on human capital over job offers. That, combined with the clearing of the pre-EE backlog, is going to result in much lower CRS scores in the coming months.