It would be great if such regulation could be introduced here - but I doubt that it would get past the lobbyists.
Just to note that EU261 does not define specifically any compensation in the case of delays, just "duty of care". However
subsequent case law/decision has meant that a delay of the arrival time to the destination in excess of three hours of a journey becomes subject to its cancellation provisions, including possible compensation.
Also, in June
a decision was ratified in relation to "the ticket price" actually meant. Basically, in relation to downgrades, "Ticket price" is pro-rata to the distance affected by the downgrade, not necessarily the whole ticket price as paid. Also, in assessing ticket price, the airlines are entitled to still take into account any +++ relevant to the downgraded cabin.