It's important to note that the FDA regs are targeted at retailers and manufacturers, not person-to-person sales. So, the estate pipes for sale at your local B&M and antique shop are technically under the gun, but not the ones at the yard sales. Of course, a case can also be made that every briar, meerschaum, morta, clay, corn cob, etc. pipe has a substantial equivalent that dates prior to the Feb 2007 cutoff date.
Even if the FDA chose to pursue estate pipes sellers, I'd think the market would be almost impossible to police due to it's "homegrown" nature. The only way that I can see it being done is if they come down really hard on just a few guys in an effort to scare off the rest.