Re: versus?
"But loitering above a battlefield to pick off tanks has become pretty dangerous these days."
Well, that depends on what you're up against. Blokes on the ground armed with AK47s and RPGs are not a threat to any airborne aircraft more than 1/4 mile away. That's plenty close enough for the A10's gun to be totally devastating.
Up against a foe with a comprehensive anti-air capability? Well that's a different story.
So it really comes down to the question about any future war zone, "What's the other guy got?".
My guess is that right now, the answer to that question is "Not a lot". In which case the A10 will do very nicely, thank you.
Why F35?
There's a whole load of military/industrial politics and bullshit behind why F35 is happening at all. My view is that we need to be able to build aircraft using the technology developed for the F35, and we need to retain the industrial capacity to build a lot of them.
However, to put it all into a single aircraft like they're trying to do whilst adding on fairly pointless things like VSTOL is expensive and will not result in a best-at-everything aircraft. [VSTOL is simply a physical acknowledgement of not having bought the right ships to fly it from].
Why not B52?!?!
It will result in an aircraft that's maybe good-ish at one thing and underperforms at everything else. It might be a good air superiority platform but that will largely be down to its weapon system, not its stealth and flying qualities. At the moment you could probabaly put that weapon system on a B52 and have better air superiority than F35 will achieve (more missiles, better endurance, etc).
Politicians and Their Responsibilities
Most of it comes down to the politicians not being willing to read a few history books and acknowledge that they have a responsibility to take a long term view as well as considering their re-election in 4 or 5 years time. Having professional politicians is crazy - it guarantees that they need to keep the job to preserve their income, so they will never look beyond the next election. It takes a really honest politician to ask themselves why F35 is happening and what it is that has motivated its backers into pushing it as an idea. I've not seen such a politician recently...
Of course, people like Putin understand this weakness, and he's exploiting it to slowly creep across Europe and the Caucasus. If he does it slowly enough he'll get a long way without any of our politicians caring or noticing or, more importantly for them, taking the blame. It's really a case now of whether Russian bankruptcy will disrupt his ambitions before any more harm is done. Imminent bankruptcy might just force his hand...
So look at programs like F35 closely enough and you will start wondering how the next 20 or 30 years are going to pan out when we've got creeps like Putin running Russia.