I actually disagree with the first part of this post; the removal of Diglett and Trapinch would absolutely not make reliably checking abra a lot easier considering that these two pokemon, especially diglett, are the most reliable ways of dealing with abra currently because of the formers ability to use beat up and the latter's ability to take a hit. Their removal would make grimer and pursuit pawniard less of a liability to use, sure, but I think people are massively overlooking the existing problems that these two pokemon have checking AbraGast even ignoring the existence of trappers. Both are considerably less reliable than Trapinch and diglett at dealing with Abra and Gastly because of their ability to use Counter and Destiny Bond, respectively. Once either mon has taken down the pursuit trapper, their counterpart becomes very difficult for the opposing team to deal with.You're not necessarily wrong that checking Abra becomes a lot easier with Arena Trap gone, but that's because AGrimer, Scarf Magnemite, and Pawniard become easier to use. Onix is already good but not exactly a great Abra check while Elekid and Meowth probably won't be great even with ATrap banned, and they're definitely not the best Abra answers.
Yeah I know this post is sorta short but I don't have much else to say. My preference goes to testing Arena Trap before Abra but honestly both would solve the issue in the short term. Arena Trap is just better long term imo.
I know that saying that one mon if banned would hypothetically make another one too powerful is frowned upon, but I think this is an instance where it reveals Abra as the problematic part of the core, not trappers.