MLB: Is the 6-man rotation a trend or a phase?

[ProfessorGAC]

3. Here's What I'm Waiting For

At least as a minor league experiment.
11 or 12 pitchers on roster.
9 guys each slotted for an inning.
Nobody pitches more than 1 inning.
But, they pitch each day.
With days off, they'd pitch 6 innings every 7 days, which is less than now.
Each day, the pitchers move back one inning. Whoever pitched the 2nd inning starts. The 1st inning pitcher moves back to the 9th.
Then, if a pitcher just doesn't have it that day, a reliever comes in to finish that inning.
I see the "inning pudhback" as a way to make opposing hitters see a different pitcher each day of a series.
Not proposing this, just envisioning someone getting to this stage, since someone will figure out that 75 pitches spread out over 5 days creates less stress on the arm than 75 pitches one day, then none for 4 or 5.