That would certainly make it easier, although I' not sure it would make it better. How would it work? Would a switch only if player A was listed as out? If player A dressed but didn't play? If player A pulled a Randy Moss and played only one or two downs? I kind of like the fact that currently owners are sometimes confronted with a gamble. Of course, when I make the wrong choice, lake last week with Dillon and K. Jones, I wish such a rule existed. I know however, that situations like these keep owners on their toes and reward diligence and research.
Overall, I would have problem with such a rule, but only when the rule was spelled out very specifically beforehand and only if the owner specifically requested its use for a given player on a given week.
I am so smart. S-M-R-T