Have their been any official announcements from DApps or users that they are on board for the migration? At this point, it feels to me like Steemit + Tron have mounted a coordinated attack the network. Would need to see major user and DApp signalling of support in order to support the migration.

Open blockchains aren't supposed to have major decisions made behind closed doors with no stakeholder consultation. The migration to TRON is 100% dependent on the current Steem community adopting it.