Will BP be forced out of the US?
There's another £13bn off BP's market value today, taking the cumulative loss since the company sprung its hideous leak to well over £40bn.
Given that BP is a core holding of most British pension funds, that's tens of billions of pounds off the wealth of millions of British people saving for a pension.
And with BP dividends representing around 8% of all income going into those pension funds (and a considerably higher proportion of all corporate dividends received by those funds), if BP's oil spill in the Gulf of Mexico causes collateral damage to its dividend-paying capacity, well, many of us will be feeling a bit poorer.
As I've written here before, it's certainly not ludicrous to assume that the final cost for BP of this mess could wipe out at least an entire year's profit (which for the past three years was just over £13bn on average) - once compensation and possible fines have been paid.
Perhaps more damagingly, the debacle is doing considerable harm to the value of its brand in the US - with what looks like every US citizen, from President Obama down, equating BP with the sullying of one of America's most cherished coastlines.
The talk among BP oil executives is that the company's reputation in the US may have been so tarnished that the board will conclude that an orderly withdrawal from America - with the sale of its massive US assets - may be necessary (it's widely thought, for example, that Chevron would be an enthusiastic buyer of those assets).
Were that exit to occur, it would represent one of the great corporate humiliations of all time, a reversal of those mega-bids of Amoco and Arco by BP - when under the sway of Lord Browne - which transformed a division-two British player into one of the global giants only a decade or so ago.
And what of Lord Browne's successor as chief exec, Tony Hayward?
It would be challenging to identify any specific decision or lapse by him as the cause of what is now seen as the worst oil spill in US history.
But some argue that BP was slow in recognising the gravity of the debacle after the explosion in April.
And then there's the boringly obvious point that angry shareholders, angry Gulf coast fisherman and angry US citizens have a very human need to blame someone - and if not the BP boss, then who?
It's difficult to see how Mr Hayward's tenure at BP can extend beyond his immediate management of this remarkable crisis.