I actually thought about this a few times. My prediction would be that if Price were canceled, CBS would hold on to it at least for awhile (or a long time) and run occasional/limited series of primetime million dollar spectaculars and/or just the show (without the million) in primetime.
Either while that's happening or after CBS finally does dive it up for good, I could see Fremantle trying to syndicate it. I'm not sure how feasible it would be since it would require a 60-minute slot on a station / many 60-minute syndicated shows do not exist. Perhaps they would change back into a 30 minute show.
As far as appearing on another network:-Broadcast Network Daytime: The only way I could ever see that happening would be if ABC canceled one of their soaps or NBC went through with the cancellation of Days of our Lives, in other words Price would replace a program. There is no way that Price nor any other show would be "added" to the daytime network schedule this day in age because it would involve taking time away from the affiliates. (See my post from awhile back:
http://www.golden-road.net/index.php/topic,1986.msg34071.html#msg34071)
-Broadcast Network Prime Time: If it were done once a week or as an occasional special, maybe, but like I said earlier, I think CBS, if anyone, would be the one to do this.
-Cable Network: Doubtful. Any TV production requires alot of effort, but in my opinion Price would require ALOT of effort for a cable game show. Most games which air exclusively on cable are relatively simple (e.g. GSN originals). Plus, on a cable network the show probably wouldn't stand out as much from other cable shows, further raisng my doubts that a network would be willing to produce it.
In the end, I'm willing to go with my original thoughts that Primetime CBS Price will stick around after the daytime is gone and maybe it will wind up in first-run syndication.