The removal of the magstripe won't force Walmart to accept contactless, but consumer demand will. I don't know what the breaking point is, but I suspect it's between 50 to 70% of consumer usage. Right now it's at 35%. There are 13 Major Retailers in the US that haven't enabled it yet. Wal-Mart, Lowes, Home Depot, most Kroger stores, Hobby Lobby, HEB, Menards, Fleet Farm, Winco, Graybar, Guitar Center, Paper Source, and Restoration Hardware.
This year we know that Lowes and HEB will be adding it, and so will the rest of Kroger locations most likely. When that happens, the acceptance rate should be close to 93%. Add Home Dept and Menards, and it will be about 95%. At that point, Wal-mart becomes the only Retailer in the top 25 that doesn't accept it, and that will put some pressure on it.
I suspect this will happen sometime by about 2025 or 2026.
Someone reported on Twitter that AMC theaters has enabled contactless at the concession stand.