Does it? Favors, Kanter and Harris are already a done deal. The only potential difference now is most likely #8-#9 this year vs. maybe #10-#14 next year. Lower pick hurts the value, potentially weaker draft hurts the value, but I don't know if it's enough to materially alter the value of the deal.
Considering that most players drafted in a given draft bust out, and I really do believe this is a very deep draft and next year's looks poor, I would say the difference between feasibly drafting one of the top 5 or 6 players on the team and a guy that is more likely to not make his next contract (aka, nobody) is pretty huge. Yes, it's speculative, but it's big. Especially since I think the Warriors could be a dark horse team (to make the playoffs, especially with a nice pick this year) next year.