Actually, this is a good post on all fronts!
I can see where owning several could become more of a "farming" situation rather than an enjoyable pet experience, but on the other hand, snakes are pretty hands off and especially BP's as far as handling and often feeding goes.
I'd be willing to bet if you changed your caging and went with an efficiency setup you'd get your mojo again.
Explain to your wife the true feelings you have, and see if you could work into the caging other folks here have mentioned.
BP's aren't like a collection of boas or large pythons that need a lot of space.
Just my opinion here but I'd wait a bit as well. Once they are gone, you may not get them back and I often hear people say they are kicking themselves for getting rid of such and such snake.
That being said, you may have been thinking long and hard about this and don't foresee the future with all seven as being enjoyable.
You will make a well thought out decision when the time comes, but really consider the shift in caging and see if simplicity makes things enjoyable again.
Good luck!