Lovable for Shopify will bring more work for Shopify devs.
Instead of worrying about being replaced by Lovable, think about the new possibilities it will bring to merchants and how you can fit into that value delivery.
For example, more merchants are now building their themes from scratch with the help of Lovable integration. This means they will rely on devs more than ever to maintain the integrations.
As a dev, you can deliver projects faster and at a lower cost for your clients. You can test ideas faster. Your CRO team can build and test funnels faster.
To me, it's a welcoming win for the Shopify dev/Agency community.