It's definitely the case that watching without having internet access at the same time can be a disadvantage. If you want to see the options available, measurements and more specific details (such as fabric composition) the live shows are now increasingly useless. The rotating section on the screen for the name and all the option details is a disaster, then the measurements are missed out completely by some presenters (ring Liverpool being the usual cop-out). On many levels watching the live shows is increasingly challenging, sadly.
I don't know how QVC's sales figures compare with past years, but I wouldn't be surprised if they are struggling by their own standards. The business model they operate is not very flexible to adapt to the kinds of competition out there. Their only significant point of difference is the 30 day money back guarantee, and some of the infommercials offer a variety of MBGs for the one product they are selling.
There are now other routes to market for new companies, so I dare say there are companies now who say thanks but no thanks, despite the potential of shifting massive volumes on QVC.
I do therefore think that a lot of the presenters have been successfully pressured into becoming much more aggressive in their approach to sales. I think the only one who naturally excels at a hard-pressure type of selling is Debbie Flint. What I do like about her is that she is always conscious about the information that should be being put across about the products she's selling. I have no time for the endless consulting of ipad for twitter etc and the constant exhortations to tweet, references to her own (rather than Q's) website. Mercifully I've not recently heard much about books...