I thought the year 2000 was a more mature product than 1999. With Russo still being there, it may have been more gimmick matches, crazy characters and ridiculous storylines. Luckily, Russo always had others to damper down his crazy ideas in the WWF, unlike his run in WCW.
With WCW and how it would fare, it depends on who took over booking, WCW didn't always have the best of luck in that department. Due to behind the scenes stuff going on with Turner, I couldn't see the company lasting long with or without Russo.
I will always give Russo props for giving all the wrestlers a chance on screen with an interesting storyline (even the ridiculous ones), which carried over I believe for the years of 2000 and 2001 in the WWF.