Yup, pretty much any of the modern condensers are at that level of performance. And note that is the SEDBUK seasonally adjusted performance figure that looks at a more real world usage than the perfect "in the lab" figures the manufacturers themselves might rather tout. If you push the boat out with weather compensation, proportional controls etc then you can get into the mid 90s.
Have a look at some of the more modern models here:
(the efficiencies quoted are using the gross calorific values)
It would certainly be nice to reduce electrical usage, but whether it makes sense long term is a different matter.
For certain values of "will". I agree that is it far more likely to coincide with natural demand cycles than say solar or wind, however it will not be an exact correlation (e.g. warmer than expected winter day, popular program on TV etc). That means you still ultimately can't rely on it being there when its needed, and will need backup generation capability to cope with when its not.
No indeed, and I was playing devil's advocate.
However you could see a creep in that direction where perhaps the "boiler" becomes an electrical generator first, and a home heater second. The electrical generation capability being controlled remotely which along with automated demand reduction some might consider to be an alternative to actually getting on with the job of generating the energy required.