Wyckoff was trading a market from a century ago. This is 2012. Things have changed.
You can take the leading stocks of the 1930s, 1940s, etc. and compare their chart patterns with those of the winners in recent years (Apple, Baidu, etc.), and you will see the same patterns (triangles, h&s, cup bases, double bottom bases, tight sideways bases, pin bars, etc.). We could split hairs and say that, structurally, there have been a few trivial changes (e.g. the tendency for stocks to fall on Mondays ended with the 1987 Crash, and since then stocks tend to rise on Mondays, in line with the other days of the week).
But why split hairs? As long as they are liquid, markets of today are just like the markets of Wyckoff's day.