Temecula was a very small old town. Kaiser Aetna developed huge tracts of land adjacent to it in the early 70's. It was called Rancho California. As it grew over the last 40 years, it consolidated into the town of Temecula.
I don't see the same development happening in Campo. There is no master plan that I am aware of for putting tracts of single family homes, apartments, ranches, and commercial development to serve the area as there was in Rancho California/Temecula. I believe San Diego County has not included a plan for developing it in to a something similar to Temecula .Rather, the plan in place calls for leaving a lot of the back country undeveloped. Temecula was ideally suited to be a bedroom community for Los Angeles, Riverside, San Bernardino, and San Diego counties. Campo, not so much.
I am not aware of any public transportation that would alleviate a long commute.
If your goal is long term, awesome appreciation, I would be happy to sit down with you, listen to your goals and situation, and give you the benefit of my years in Southern California as a Banker, Financial Planner, and Realtor.