You are able to silk touch spawners that you have placed. Natural spawners and spawners placed by other players cannot be mined by you. I don't think there's a need to change anything about spawners in survival now though. They're doing just fine
Xrayers :/ I see holes dug straight to spawner rooms sometimes, imagine people in starter kits holding 2 or 3 spawners :/ they've just started with 300k
you know you can no life farming emeralds from farmer villagers for a day and have a decent amont of cash to buy spawners with