The problem is suspect testing can't really be trusted to come out with a conclusion other than "yeah, we're just banning this outright" because of how circlejerky things get.
Limit, not remove.
Not only is half of that team gone with a cap on BP 'mons, honestly, the way I see it, there are two logical, fair, useful outcomes:
BP is limited to three pokemon, Scolipede + Espeon cannot both have BP on a team.
This stops players from using the most powerful setups in conjunction with another BP mon to round out the boosts, further limiting the feasibility of full-on boosting and forcing the hard choices this build needs.
BP is limited to two pokemon.
Free choice to run the two "best" builds for BP, this is less complex, although ti could be slightly too strict. We won't know until it's done. I'm sure this panders more to the people who are just begging to see it banned, though, as it's a smaller number than 3.
Limit, not remove.
Let's be blunt here. There is only one team that people see constantly used upper ladder and it's Scolipede/Zapdos/Espeon/Sylveon/Vaporen/Smeargle. Occasionally with a Mr Mime thrown in somewhere. This particular team is used by literally dozens of players and over-centralizes not only the entire meta but the very ladder itself. Why? Because it's broken... Even then: Espeon. Should the move itself be banned? Course not. I believe the obvious solution is to simply ban Espeon having both Magic Bounce and Bp simultaneously. That simple change alone would eliminate the problem whilst keeping the playstyle itself in a reasonable standing... Bp is clearly broken. Something NEEDS to change.
Not only is half of that team gone with a cap on BP 'mons, honestly, the way I see it, there are two logical, fair, useful outcomes:
BP is limited to three pokemon, Scolipede + Espeon cannot both have BP on a team.
This stops players from using the most powerful setups in conjunction with another BP mon to round out the boosts, further limiting the feasibility of full-on boosting and forcing the hard choices this build needs.
BP is limited to two pokemon.
Free choice to run the two "best" builds for BP, this is less complex, although ti could be slightly too strict. We won't know until it's done. I'm sure this panders more to the people who are just begging to see it banned, though, as it's a smaller number than 3.