Basically zero. Transiting the canal now is a very bad sign. It's well over $200k to transit a cruise ship even empty. So while already in money-loss mode, they just paid that out, and would need to do it again to return. While the third transit would at least have passengers aboard, the margins of the WBPC and the cruises still uncancelled out of SD are unlikely to hold up to fully re-staffing the Wonder and paying for the three transits - and that's before we talk the fuel in use now and the fuel for an empty return.
And $200k is generously low, TBH:
https://www.seatrade-cruise.com/new...ority-proposes-higher-tariffs-passenger-ships