do ever see Google moving to an all add/properties page one?
Ain't gonna happen. Why? Because advertising works best (and attracts the highest rates) when it runs alongside content--whether that's on a Web site, in a newspaper or magazine, on radio, or on TV. Organic search is what attracts users to Google's SERPs, and Google isn't about to toss out the sugar that makes the medicine go down.
Besides, not all searches are "transactional" searches. In fact, most probably aren't, and most SERPs don't have so many ads above the fold that the organic results are pushed into deep-scroll territory.
Here's what I think could happen without threatening the integrity of Google's search results or driving away users:
1) Google could add display ads to its SERPs. This would work especially well on informational pages, where searchers may not have an immediate purchase intent but are open to relevant messages.
2) For searches that could be either "transactional" or "informational" (say, "widgets" as opposed "where to buy widgets" or "widget reviews"), Google could give more weight to to informational results, which would encourage sellers to buy ads while reducing the ROI for commercial spam.