Steve, with all due respect, I think you may have it backwards. We're being held up due to futures expiration this month and the large open interest in the stock and index options.
April is an entirely different matter. There is very little open interest, no futures expiration, and therefore no floor.
March is also the end of the 1st quarter. Lots of folks like a good 1st quarter for their funds.
Looking for a macro bottom this month is a poor bet. Next month the US market may join the rest of the world in breaching the October lows.
Check out 2001 and you'll see the US was a bit late to the party then too, but we eventually showed up trashed in September.