People also go on about batterys getting cheaper. I find that laughable and ignorant.
With all due respect - I vehemently disagree. Consider - battery technology was rapidly developed in the late C19th, and almost completely stalled in the early C20th with the rise and rise of the internal combustion engine. It's only in the late C20th that interest in batteries started to revive - mainly because of these newfangled mobile/cell phone things, and the advent of laptops. Battery research and technology is now at a fever pitch, and is only going to get bigger as the market grows. More potential sales $ = more research = better, smaller (size... bigger capacity), faster.
If one looks beyond the media hype, Current tech batteries in Lipo etc have already fallen all they are going to through production and scaling. The resources to make them are limited,
Agreed - lithium has a finite lifetime as a battery tech. It's served us well, much like leaded petrol did in the early days of the petrol engine, and now it's time is drawing to an end. Alternative chemistries are being researched now; some (many) will prove to be impractical for one reason or another, but it only takes one or two to beat LiPO, and the job's done.
And yes, yes, before you say it: There's a massive difference between R&D/lab scale experiments, than a commercial quality offering, but the demand IS there now; the demand is ONLY going to get higher; and DEMAND is what will drive the R&D into commercialisation. It may not be the best tech that wins (see VHS vs. Betamax), but whatever tech comes through will be good enough.
The argument about generation and delivery capacity..... yeah, well, that's a whole different gether all to twist.