Someone more cynical might ask if the IRS is truly being benevolent to those poor FFI's (whether Model 1A or 1B), or behind all the bustle and hubris lies the fact the IRS itself may not be ready for the massive amounts of data that will be arriving on 30 Sept. 2015? With ACA (Obamacare) and restricted budgets, will all that data simply be transposed to a back room storage drive and only be looked at in a years time, if then? There's also the fact most Parliaments (see David Gaukes' very brief speech to an almost empty House of Commons) around the world sold FATCA on 2 premises; 1) by being a Model 1 IGA, there would be no 30% withholding and therefore less expensive for the local FFI's, and 2) reciprocity. Since no small community bank in Iowa (or more importantly, Florida or Texas) will scouring their files searching for those with a 'foreign' indicia, it all becomes a bit embarrassing.
Of course, we'll never know. As a UK taxpayer, I'm far more interested in those UK residents with undeclared bank accounts (or even worse in Delaware) in the US who might be evading HMRC.