Don't panic captain mainwaring!I can see the point of a lot of these rules - better vacuums, less marketing BS, greater durability, fewer Dysons, but the wattage one is daft.
However, most CCs use a Sebo BS36, which is about 1300 watts, so a good while before they're banned - and it's only the sale that will be restricted, not the use. Kirbys likewise 1200 watts, I think.
But a big part of how a vacuum works is to do with vacuum design, not power.
So, 'dirty air' push cleaners, like the Oreck XL, can deliver outstanding results at 350w. And vacuums with a huge filter area (like tub vacuums - Henry if you like) are pulling air through about 1,250 cm2, while expensive domestic canisters like AEG and Samsung are pulling the air through about 20cm2. Dirty air cleaners (Kirby, Oreck, Royale, etc.) also have huge filter surface areas. So I think there is hope.
But also, domestic vacuums and commercial ones are not the same - the regulations that apply to domestic washing machines do not apply to three-phase commercial machines.
The very best, openly published standards of vacuum cleaner performance are at the American Carpet and Rug Institute: they publish their criteria, and rank any vacuum submitted to them. You can find their results here:
https://www.carpet-rug.org/CRI-Testing-Programs/CRI-Seal-of-Approval-Program/Vacuums/Certified-Vacuums.aspx I don't think we need to panic!