I'm always encouraging my dad to shop around online rather than just purchase retail because of the savings to be made but, rightly or wrongly, he's always bought his DSLRs from Jessops. So far thats been the Nikon D60, D70 and D200. He also bought my D90 for me at a cost of £800.
If it'd have been me, I'd have looked for the best deal from a reputable online retailer. Some people though (particularly the older generations who are either PC illiterate or fearful of online transactions) prefer to see what their buying knowing that if there's a problem, they can take it straight back to the acne-faced young man in the shop, who tried to sell them the extended warranty too. I am trying to make him see the light, especially with regard to spending money in Jessops lol.
I agree that Pentax really are in a major dilemma and as Chris mentioned in an earlier post, they are suffering from a lack of direction. If they were to move towards the micro systems in the near future, like Olympus and Panasonic's M4/3 system, they again would be late to the table with their offerings. Consumers would most likely already be locked into their new lens systems and would require a big incentive to once again jump ship.
The only way I can see Pentax making waves rather than going under, is by giving the consumer quality cameras like the K5 but, at a vastly reduced price of the competition, at least short term. While the profit margin per unit may be reduced significantly, the volume of sales would hopefully outway it. More importantly, once consumers were on board, they'd then be locked into a Pentax lens system, which would go a long way to protect its future in the marketplace.
Rather than try to convert photographers away from their current systems, perhaps targeting those moving from compacts to DSLR for the first time will be their their best bet but again, a lot of those people are the ones that walk into the Jessops stores in the big shopping centres, with no Pentax cameras in sight and even if they were to buy a camera mag, they'd be hard pushed to find a Pentax advert in them.
When I was growing up, photography was for anoraks and old fuddy-duddies, in dark rooms with red lights. Now with the internet and the ability to share images across the world, photography has become fashionable and fun. Nikon's latest ad campaign (I Am Nikon) has really brought photography to a wider and younger audience as its been marketed as a hip and trendy thing to do. I honestly couldn't tell you what the latest Pentax campaign has been

.
I'd love to see Pentax make a return to their former glory but as you say, the odds are definitely against them. Unless they significantly increase their market share, I wouldn't be surprised if Pentax disappeared in the next decade or so.