And it might even make their index more fresh. Paid submission at affordable rates such as at Inktomi is the best model because it still relies on true search relevancy of the page. Maybe a service where you can call a search engine and speak to someone about technical difficulties with the site, index issues, etc. Maybe then they would actually pick up the phone. I would like to see more keyword planning tools for webmasters.
More banner buys with rates based on clickthroughs.
For those who have multiple web sites and need listings with multiple search engines and directories this can run into serious money even with affordable pricing. We need something reasonable in place, especially for small commercial businesses. I would like to see keyword popularity for each individual search engine i.e. similar to GoTo's suggestion service. It would also be nice to find the keywords that have been used to find a particular website i.e. by entering your competitors url you could find out what keywords users have entered on a particular SE in order to find that site. Might encourage more buying and both parties are happy.