No, thats not how that works.
"if a team was in the top 5 and went to top 10 from 1 map getting rotated out the pool, they are not a very good top team."
Good teams typically have 2 maps they specialise in, because if one gets banned the other can be picked, they will then had maybe another 2 to 3 maps they can play but they arent home maps, if you remove a home map, the other team that plays them can take them off of any home map and force them onto maps they arent as good at, if the new map doesnt not suit them they have screwed, if the other 2-3 maps also arent home maps for them then what do they do?
Lets take it the other way, a team outside the top 10, really like this new maps, they get artificially boosted by this random new map.
Then even if you tell them 6 months in advance they have to practice another map, taking away from the time they have to work on current maps, making the, slightly on the current maps.
This idea does not work from any standpoint.