RE: Battery rental 'issue'.
I think there are a number of good reasons to adopt the battery rental model, but the problem is twofold: firstly, those reasons are outnumbered by reasons not to adopt the battery rental model, and secondly, you will have a hard time persuading the buying public that it makes sense anyway.
Even now that Fluences are pin money, there remains a nagging doubt evident on EV forums everywhere that your purchase will forever tie you to Renault dealers. Example: no private buyer is going to turn up at your house with wad of £20 notes for the car and a pen to sign the lease, a legally binding and highly ambiguous document that he or she will have never seen before.
OK so you could dispose of the car at your dealer. But you will forever be wincing at trade in values, and your local Renault franchise will in all likelihood be terrible. Admittedly there was an Auto Express survey last year which placed them high up the satisfaction charts, but considering they have languished at the bottom of every single table I have ever seen, and for decades, I'm unconvinced.