COP1 parity will be reached in cold climates such as Northern Finland easily but I for example live in Southern parts of the country, Google up "Tampere climate" for a rough idea what we are talking about. Much colder than NYC, for example, but not that bad. Some do install ground-source heatpumps but I don't think it's usually necessary here. Go some 500km North (google "Oulu climate") and things get very different. Yet people do install air source heat pumps even there and with a well adjusted system, are able to reach and exceed Seasonal COP of 2. Cost of heating oil and electricity is now basically 1:1 per energy here, so such 2x energy saving pays back.
For example, my heat pump, a modern quite well designed but still a cheap Chinese unit kind-of-but-not-quite designed for Nordic climate, reaches COP1 at dT=80 degC, i.e., at ambient -25degC water +55degC. Obviously at that point it's wiser to turn the compressor off and run resistive elements, because such usage is also hardest on the compressor, eating more of its life hours.
The change has to be done somewhat earlier from simply the power sufficiency viewpoint. My 9kW nominal machine supplies 4kW at -15degC out / 45degC water, and it also happens my home requires just this, 4kW at -15degC. Below that temperature, resistive support heating would be needed, unless I bought a larger heat pump, but that would be an expensive extra investments just to get slightly higher COP for a few weeks per year. Combining 4kW at COP1.84 and 1kW resistive aux power at COP1 is COP1.58.
But yeah, 3x price difference between electric energy and burnable thermal energy (gas, coal, oil, wood, whatever) pretty much negates the whole point of getting a heatpump. But this is a (stupid) political/business decision; I believe - or hope - it's going to change. If the aim is to Save The World by reducing CO2 and burn less fossils, burning all the same fossils in modern power plants to run distributed heat pumps at households is already a massive improvement; adding renewables such as wind, solar, hydro on top only helps.