Given the Ludendorff offensive failed I don't think you can call stormtroopers alone a solution. High casualties, outrunning supply and obtaining territory that is hard to defend which weakens your overall position.

I don't agree that tanks had reached some ineffective impasse. Quoting wikipedia:

> By 1918, tank capabilities and tactics improved, their numbers increased and, combined with French tanks, finally helped break the stalemate. During the last 100 days of the war, Allied forces harried the Germans back using infantry supported by tanks and by close air support. By the war's end, tanks become a significant element of warfare; the proposed British Plan 1919 would have employed tanks as a primary factor in military strategy. However, the impact of tanks in World War I was less than it could have been, due to their late introduction and the inherent issues that plague implementing revolutionary technology.

https://en.wikipedia.org/wiki/Trench_warfare

Plan 1919 was going to use 30,000 new faster tanks.