+ stop debating about which bitcoin is "real", no need to fight for small group of btc fans, better focus on billions of people who not yet in crypto and convert them to bch
At some point, as hashrate moves away from BTC, it will only exacerbate the problems on the BTC chain. Congestion will grow and diff adjustment will take longer.
It's possible but highly unlikely. That would happen only in case BCH is adopted on a mass scale and the price will have up pressure with velocity but we're years from that.
IMO, assuming most tx are inter exchange transfers, hash-rate flippening happens when (1) Block reward becomes nominal and (2) all exchange transfers go over lightening -- if it works.