Nobody is going to invest in designing and manufacturing a boiler that will last 20+ years...
Not for today's domestic market.
The changing regulations will ( almost ) always be intended to increase efficiency and reduce emissions from domestic properties. Moving towards the perfect boiler.
Designers could create a perfect boiler today that would meet all foreseeable changes in the regulations.
The only reason the perfect boiler would not be put on the market is because it would be far too expensive for the domestic market.