Critical question is- who gets the iron fields? The main iron ore deposits of both countries sat about 15 kilometers from the border on either side. If the French lose theirs and the Germans keep theirs. Reverse that and the war ends in six months. Germany is getting 30,000,000 out of 36,000,000 tons of iron ore from their mines around Metz. Even putting them in artillery range is enough
So with the French so close to the border, this becomes the area of combat. Germany cannot possible afford to lose them and their willingness to send troops further East is hampered
Italy also sees France in much better shape and is more likely to join the war effort earlier.
In any event, the effort at Gorlice-Tarnow is likely to be much less- maybe just push the Russians back keeping them in the fight
Effect on Bulgaria will be crucial. Also doubt if the Ottomans would be joining Germany in this situation but possible