They already allow you to send your usd balance to any lightning QR so it would make no sense for them not to make this change but from all the other improvements they’ve made I wouldn’t be surprised if they stop one step shy.
The opt-out model is doing a lot of quiet work here. Most Lightning adoption discussions focus on convincing merchants to act — this skips that entirely. Millions of sellers wake up on March 30 with Lightning enabled, whether they thought about it or not. The activation energy problem just got solved by default.