Last week the UK government had its energy review and decided serious cutbacks need to be taken to reduce the levels of energy consumption. The potential threat for Nintendo is from the governments want to ban the standby feature on many household appliances, which include DVD's & TV's.
It is impossible to tell whether or not the Wii will be effected by the laws government wish to impose, there is a high probability that the Japanese giants will slip through the net.
So in summary there may be a chance that the always-on idea is no more for the UK. But by judging from the promptness of most new laws... we will be in the next-next generation of consoles