Well in some nations while others have some question marks, i.e the crop of fast bowlers that England have at the moment once thet stay fit can be top-class group in the future, Australia with Johnson, Tait, Lee running the line looks devastating, the Saffie with Ntini/Steyn, India (hopefully for Indian fans) Patel/Sreesanth/Khan along with Bhaji & Kumble & Pakistan with Asif/Kaneria.
The Kiwis, Windies, Sri Lanka have potential but will have question marks if those bowlers can be consistent. So its an improvement all-round in world bowling when for a long while after Donald, Wasim, Waqar, Ambi, Walsh retired that it was only Australia & to an extent South Africa left with top quality bowlers in their sides.