I remember last time the oil price was 50/barrel it was seen as an inflationary price.
Also, we are seeing massive money creation - the loans are being written off, but the money has already been spent - what's been destroyed is the need/ability to pay it back, so essentially people are having their debts written off and more money is being loaned in to compensate. And the massive injections of liquidity will find their way back into the system over time.
We may see a short period of deflation, but I'd be VERY surprised if we're not seeing inflation shortly. In fact I am betting on hyper inflation within 3-5yrs.
I think that the main reason for the current delfation is that because things aren't selling, there is a huge glut of inventory in shops, services, factories, warehouses etc. etc.
However, a lot of these products are now being sold at a loss and when the current inventory is gone, where is the incentive for people procure more? E.g. who is going to mine metals at a loss? Who is going to produce food at a loss? Who is going to manufacture goods at a loss?
I think that useful, essential, tangible goods will experience inflation like we haven't seen in 30yrs, whilst luxury tat will fall through the floor.
Just my two cents, which will be worth 2 bucks in three years time.