I don't see why anyone would want to make the only option wholesale slaughter. Essentially you are gonna be forcing the whole village to deal with a bijuu challenge instead of just the hosts.
Because haphazard slaughter's fun?
Well, at least these challenges would be more dynamic and more relative to the series in that bijuu are entities treasured enough for an entire village to have to experience some war or assassination-centric arc. If the village doesn't like it, then banish/extradite the host. If the bijuu's sealed within the leader of the village, then overthrow/kill/chase them out, simple (or just leave the village until you can muster a force capable of doing the aforementioned, that works too).
People generally do hate the biju. I mean, I became the host of one for goodness sake! Few people are climbing over each other to get the beasts in the first place, at least not in Konoha they aren't/weren't.
And no, haphazard slaugher is not fun, especially not for the victims or (if the defenders have anything to say about it) the attacker. The last time 'slaughter' took place, it was either single guy RPing the destruction or a battle broken down to a bitter OOC fight.
The 2/9 attempts is in regard to the villages in the series; Konoha and Suna are the only ones shown getting jacked up for their biju ( 1 and 9 tails respectively, which carries some irony to it I guess) while most any other shown getting captured were usually caught outside of their villages.
While making an entire village deal with biju challenges makes sense series-wise, it doesn't hold much more SL logic than outright getting rid of the pesky beasts altogether. Wait a minute... That's a great idea! Getting rid of the biju would make the world one step closer to making sense again! xD