I believe it's happening but I don't really understand the appeal to retailers. Maybe right now, since the market is so far down, but what about when BTC is hitting all time highs? I know I wouldn't want to be selling anything for BTC when it's at 25k or 50k, as I know whatever I get will go back down. Though I guess even if you get it at all time highs you can swap it out to USD right away. It would likely depend on how familiar the retailer is with crypto trading.