Regarding a large ranch-style home on 1/2+ AC in Temecula, I think you are absolutely right by waiting it out to get exactly the right one at the right price, Scaredy.
There is NOT an infinite pool of buyers in this price range for that area. Most folks who can spend $500K+ would choose to buy in a more convenient area, IMO.
This is nothing against Temecula but you appear to be looking for a “niche” property there that might cost $750K in Poway. The VAST MAJORITY of folks who buy in RIV Co. who HAVE NEVER BEEN residents of RIV Co. do so to get the most bang for their limited buck without regard for commute times.