I hear you, but I think the situation back in 1860 was a bit different than now. We could probably move 30000 people from Cairo to Suez in less than a day, while back then it would have been a huge undertaking (I could be wrong, I'm not a historian). Same with preparation and everything else. Add in the novelty of the canal at the time of construction, compared to now when we have lots of experience (we as in humanity, not me).

> If that's the case, then waiting the 2-3 weeks it would take to dislodge the ship itself may make more economic sense.

Is it actually established that it's even possible to dislodge the ship in it's current state? As far as I've read, we don't really know how to even get the ship unstuck at this point. Some people are pointing to the ship being too heavy, so would need unloading first, but that'll take months.

The canal was expanded in 2015 to support bigger ships. You can lookup how long that took and treat it is a lower bound because this would not have most of the work already done like when expanding the existing canal.

Dredging a 35-kilometers-long and 24-meters-deep shipping route in a year

https://www.magazine.boskalis.com/issue02/suez-canal-expansi...

Dredging is so much easier than digging, but it still works as a very conservative lower bound. That's 3km a month, so a diversion of 6km would take at least 2 months.

But earthworks of that size have to be planned and approved and the labor organized. It could never be done in that time frame.