With the release of 10.2 and plans to deprecate the ArcSDE command line tools, there has been lots of talk about how all these tools will be replaced.
The following technical blog and forum addresses some of the questions you may have regarding the deprecation of the SDE command line tools:
Do This, Not That! – Alternatives to using SDE command line tools
Alternatives to using SDE command line tools – Blog Discussion
As you can see, even though there are plenty of alternatives in place already, Esri is still currently looking into users requests to have more SDE command line functionality replaced via GP tools or the GUI.