The writing on the wall has been there for the 7% target with forward guidance and in the US they have already dropped this to a 6.5% unemployment target. I expect the BOE to do the same, exclaiming that it was only a guide and as you quite rightly said, after 5 years of 'temporary' according to the BOE above target inflation we are almost at the 2% target, although it is expected to pick up a bit later in the year. Much of this drop we have the US to thank for, as fracking is meeting more and more of their oil and gas requirements, so tight oil is less tight and prices are currently stable to dropping slightly. Never underestimate the effect the cost of energy has on the global economy.
They will do the same in the UK by changing the unemployment target as the important part from the planning point of view is getting businesses to invest in a self fulfilling recovery is sticking to the no interest rate rises before 2015 / 16. Don't forget 2015 is an election year and the Tory's will not risk affecting economic growth where this is their only major trump card. "Look we fixed the broken economy, the work to recover from the 2010 Labour mess is not finished, give us another term to do so".
An average economic cycle is 78 months, with the current one starting in 2009, so expect a bit of a slowdown at the end of 2014 and 2015 and this was only reflected yesterday in the IMF updated predictions for the UK economy, where growth is expected to be a bit lower next year.
Personally, I intensely dislike forward guidance as I think it makes a central bank a hostage to fortune. On the upside with growth in an economy, interest rates and other measure work well in controlling a boom, but on the downside the last 6 years have shown that central banks have virtually no tools in their locker and they are a bystander like the rest of us to what the economy does. One of the few tools they do have is the element of surprise and forward guidance removes this.