Maybe Big Thunder has the same sort of problems Space Mtn has because it's an older ride. They didn't think that SM was fixable so they decided to replace it. I'm wondering if BTM could use a rebuild in light of the accidents.
I don't know, just thinking 'out loud'.
If they did rebuild it (I'm not talking about getting rid of the ride...) they could add a couple of new elements to keep things new and exciting.
I'd love to see the ride take one extra turn to go through one of the two tunnels across Big Thunder Trail, around by Cascade falls and back again. That would be neat. Why not? It's just sitting there.