My gut reaction is that this is baseball giving window dressing. They get nobodies from the minor leagues. Too many things going to bother to research. If somebody is ambitious enough to check or has nothing better to do, please check, and see how many BIG names have gotten massive suspensions. Manny was near the end of the trail, and just about everybody had grown tired of the antics. So he was made an example. Current day - ARod is out a year, becomes active and is making obscene sums of money. All those HOF voters thump their chests about Bonds, Sosa, McGuire, et al. Also, there probably are still substances that can go undetected by current tests.
Recommended off-season reading, for anybody who's interested in the subject, Game of Shadows. It's mostly about Bonds and BALCO, but you will become very well-versed on the subject, because those guys did their homework.