Who wants to bet...
It won't be compulsory, but those that install them get a discounted tariff... Sorry, I mean those that don't install them suddenly find there tariff rate increases, and the new cheaper one (the original tariff price) is only available to those that say yes to the meter.
I might say yes, just to see their reaction when they discover the mobile signal in the cupboard under my stairs... I have to put my mobile on a window ledge to get a signal, and even then it's hit and miss.
Even if it does get a signal, a remote switch off can be easily prevented by some strategic use of tinfoil (no not on your head you nut!).