My grandad is blind and has used a stick for about 30 years. He manages very well on uneven surfaces (the pavements in our town centre are a serious hazard) as he knows when the height is about to change, even a little. He has and will manage just fine with a cable on the road (not unusual around roadworks). Also, don't underestimate the number of helpful people in the world. People warn him about all sorts of hazards. The most frequent is when the traffic lights he's waiting at aren't working (drivers as well as pedestrians and workmen have stopped to tell him and help him cross). I assume guide dogs would see a cable as a hazard but I'm not really sure as I don't know anyone with one.
He's just one person, though. I'm not blind and I would be concerned about not seeing a trailing wire and tripping over it.
You make it sound like blind people should just 'not make a fuss' - like they don't already have enough challenges to deal with in life and should just put up with another big one on top of the rest.
There will not always be helpful people around, but even if there are, blind people should not be reduced to having to rely on the serendipity of others when walking down the road. Would you like to have your independence taken away by being told that you 'just need to hope that there's somebody around who will help you' when you previously managed just fine on your own?
I can't imagine getting to a point where councils actually suggest residents trail wires across the pavement. Far more likely to gradually increase charging points. Or perhaps we'll arrive at the stage where you can pay the council to install a roadside point that is powered by your house with buried wires, in a similar way to how you can pay for a dropped kerb and H bars.
I think you're probably right there, but I think the key phrase is 'you can pay the council'. Do you really think that everybody will be willing/able to do that and not just take the cheap way out? Plenty of people who have concreted over front gardens already don't bother (or can't afford) applying/paying for a dropped kerb. Some of them leave blocks of wood there permanently, which can be quite a hazard - but at least road users should all have sight to be able to avoid them. Never underestimate how many people there are out there who couldn't give a stuff about other people if they can save themselves some money.
People who rent, with landlords who don't pay for a proper charge point, also aren't going to want to pay for it themselves. Similarly, many people who are planning to sell up and move before long will not see the point in making an investment that they won't benefit from long-term.