The only way to properly repair that is to remove the sole, remove the welt, put the shoe back on it's original last (which only AE can do), re-last the upper, staple the leather to the canvas gemming, and then sew on a new welt and sole. If a cobbler implies otherwise, he's not trustworthy. While an extremely skilled cobbler may be able to get them "wearable" by doing this type of major surgery either by hand or with whatever equipment he has on hand, they won't ever quite be their original intended shape without the original last. As Suit of Nettles said, however, this is all assuming that there is enough leather to re-last the shoe. It's not possible to tell until the shoe is opened up to see if the inseam tore or if it just wasn't stitched properly to begin with. It's more likely that the inseam tore, which doesn't bode well for a repair.
Thanks for the info MWS!