I would be opposed to that adjustment. I'm biased, but as someone who traded for prospects during the season (smart moves or not), I'm making pretty decent use out of all 10 slots. Removing two of those slots would have a bigger hit on my roster flexibility than others.
If anything, the 9th and 10th slot were an annoyance at the time of the prospect draft, when we were drafting dusters that nobody's heard of. From here on out though, prospect drafts are going to be thinner and won't take nearly as much time.