Thats the point - you run it through Gaza. Alternative routes more expensive.
The expensive part would be the getting through the mountains, wiping out Eilat as a major resort and excavating something twice the length of the Suez Canal, which serves it's intended purpose well. Was never going to happen and Gaza makes no difference at all.
As an aside, looking at the viability of a new canal, I took a trip down memory lane via Google Earth on the Sinai Peninsular, I got a shock or two.
Dahab, we slept on the beach for one night, apart from the odd Beduin, we were only souls there, it was remote in every sense of the word, we made a campfire, had a few drinks, maybe a joint, and lay there looking at shooting stars. It was after about 5 minutes someone said "they're not shooting stars they're ******g tracer bullets". We all jumped up and ran as far away from the campfire as we could, it was the only light source for as far as we could see, and Jordan was just across the water. The next day two of us almost drowned in a rip tide, we didn't so that's good.
Anyway, zooming in on Google Earth, it's a big holiday resort.
I've mentioned Sharm El Sheikh before so our destination After that was Ras Mohammed, apparently one of Jacques Cousteau's favourite dives.
When we approached there was a single track marked by rocks, signs indicated mine fields either side, when we got to the beach the only signs of life were a military lorry, presumably supporting the machine gun post on a small hill manned by half a dozen Israeli soldiers. Nothing else there other that the coral cliff, the fish and the sharks.
Look at Google Earth now, hotels, swimming pools, holiday resorts.
I suppose everything has to change.