The long-range planning you are doing guarantees you will pass up most of the best opportunities in favor of lesser ones. With your spending, there's no reason not to open a new card as soon as you're not meeting min spend on the previous card. Then you will be earning 5-50 points per dollar on ALL spending. But learn what the best offers are for different cards, and only open them when that offer is available.

Sapphire Preferred can be downgraded to Sapphire with no fee to keep the few points you haven't transferred out and continues to give 2X on dining, and then you can open another CSP 24 months after getting the bonus on the one you currently have. Fees cost more than the second-year benefits of nearly every card unless you do heavy MS on that card.