I think you are misrepresenting the position of wallet (softare) devs, (and the position of exchanges/businesses). The reason that wallet software is supporting segwit is because the devs believe there is a decent chance it will be implemented, and if segwit is not supported, then users of their wallet software will be unable to validate segwit transactions (what could be the majority of transactions). The same is true regarding exchanges, if an exchange is not ready to implement segwit, then once segwit is activated, they will have no way to validate they have actually received deposits, which is just asking for a disaster.

Although not directly related to SegWit, this reddit post is a better indication of the experts who are running major Bitcoin related businesses' opinions. Provided that you trust that the author of that post is not lying (I am unsure of his ability to be trusted one way or another, although I have not seen any contradictions to what he has said), then the majority of Bitcoin related businesses are neutral to the issue, and do not support one side or another.

I would also point out that major businesses were threatened with bans on r/bitcoin after they publicly showed support for XT (and baseless ad-hominem attacks were thrown at the same businesses after they showed support for XT), so there is a legitimate business reason to withhold public opposition to SegWit (and public support for BU) if that is the business' actual position. There is no such business reason to withhold public support for SegWit when the business' actual position is that they support SegWit.