Let's look at how much fbs football has changed over the past 10-25 years.
10 years ago the college football playoff wasn't a thing and we were still in the bcs era. There was no p5 and g5. The WAC still existed and the big east hadn't become the AAC yet.
25 years ago fbs was known as division 1-a. The bcs didn't exist yet which means there was no national championship yet. The big west and southwest conferences were still a thing. There were 12 independent schools at the time and 7 of the 10 conferences had multiple teams ranked.
The game has made massive changes in a very short amount of time and there's no sign of it stopping. We know 10 years from now conference realignment will happen and there's a solid chance the AAC won't exist in its current form. 25 years from now the playoff will probably have expanded multiple times. Every conference will probably look different. The big 12, Sunbelt, c-usa and ACC will probably either not exist or be so different we wouldn't recognize it.
You get too caught up on p5/g5 when those things won't even exist in the not too distant future. We need to win the games on the schedule and keep building a solid foundation until its time to take advantage of these big changes on the horizon.