The problem with the bold part is that we're not talking about carte blanche here. Radiology practices have a long-standing expectation that new employees are fully-trained and ready to produce on day 1, so it'll be an adjustment for them. They will adjust, no doubt, because they'll have to, but the people exiting training during the transition period are likely to bump up against unreasonable expectations borne of the old system.
There's also the question of risk. We all know that a business takes a risk when they hire someone new, but heretofore that risk was mitigated because the employee came with board certification, which gave the practice reasonable assurances regarding his competence. Now, practices are forced to hire people who, at least in theory, may never become board-certified (and in PP radiology, that's a show stopper). So, if you're going to have to dismiss someone due board failure, then it is much safer to hire the fellowship-trained guy for 4 months than the general rads for 16 months, having "wasted" a whole year's worth of resources on the latter.
A semantics issue: for specialties that become boarded after residency, is it really correct to refer to yourself as BE while still in training? My thinking is that successful completion of residency is a requirement for BC, so until you've checked that block, then you're not BE.