Internet advertising analysts are of the view that the PPC model will change, perhaps for the better. These are the changes predicted:From paying per click, the advertiser will have to pay a CPA (cost per action) - that means the advertiser will have to pay only when the visitor who clicks through to his website buys something. This is manna from the heaven for any advertiser, but it has yet to be tasted.The pay per click advertising model will be supported or even called a pay per call model. What will happen is that when the Internet world is taken over by Internet telephony and surfers surf the net wearing headphones and speakers, the pay per click (or the pay per call) ad will have a telephone icon next to it. The visitor will click on the icon and generate an enquiry and that will tr...