Sure, but there's still a lot of people who don't want to, simply because coal is cheaper than both eco-pellets and gas. My grandparents only changed theirs from coal to gas last year, and only because grandpa was getting too old to go and add coal to the boiler every few hours - but they've been complaining about the fortune that the gas is costing them ever since.
And one won't be implemented for the same reason why coal boilers haven't been banned yet - "think of the poor people - if they cannot afford their coal for winter how will they stay warm?".