I may be way off here but I'm pretty sure the prospect draft is already the same as the FA draft and is the cumulative of both seasons. In the rules it's plural, "previous seasons records". We could look back at previous drafts and find out but again I think for both the FA draft and prospect draft it is cumulative records of both previous seasons and then the lottery for just the top 3 spots. I'll go along with whatever but I think the change you propose (which I agree with) is already in place.
Or I could be making an idiot of myself because I'm reading it wrong and don't remember exactly how it was done in the past. :oops:
Regardless I agree with your decision 100% to want to change it to both seasons. Doesn't change too much for me, I don't have any picks til the end.