I too am a big Zapier user, integrating a bunch of 3rd party apps (mailparser I/O, Google Sheets, MailChimp, HubSpot, Acuity Scheduling and others. Native support, as described by Andreas, for Zapier in Wix would be huge for me.
However, I fear others here might be correct, Wix won’t do it. It would cannibalize Wix’s own apps that they get revenue from (e-commerce store, online scheduling, mailing, etc.).