See the Blockstream team[0] and cross reference it with dissenting developers[1].
Alex Morcos has written a good take-down on why even if prominent companies like Coinbase are willing to fork, it doesn't really matter[2].
Personally, when Barry emailed one of the organizations I founded the messaging was as Alex put it, bullying. There was no room for discussing or changing the proposal, just, "my way or the highway". We opted not to sign the letter because of that, among other reasons.
My beef with the framing, and hence suggestion to re-title, is because this type of bullying aims to disenfranchise users. When Facebook rolls out an upgrade, as a user you are more or less along for the ride. Bitcoin is a participatory technology where everyone can have a real voice and influence, every user gets to decide if they want to opt-in to this upgrade attempt or not.
[0] https://blockstream.com/team/
[1] https://en.bitcoin.it/wiki/Segwit_support
[2] https://medium.com/@morcos/no2x-bad-governance-model-97b8e52...