I once bought a pizza from hungry.dk using BTC but they stopped accepting it now. I emailed them if they would accept BCH/cryptos again but no reply. Keep asking until they do.
No. It seems they are stuck on BTC or gave up on payment processing - I don't know. They support BCH but via Shapeshift to BTC (which of course takes huge fees).
Yes. We got a lot of (major) businesses with us, when we forked. Sadly some of them are still stuck on the other side - though the fork turned out extremely successful IMO.
1) Look at all the businesses adopting BCH. In the beginning almost every person and business thought that BCH was pointless but then Coinbase etc. changed their mind.
2) And then Segwit2x got cancelled and then a lot of people and businesses realized that BCH was a great idea. BCH was what saved big blockers - if BCH didn't fork we would ....