Regardless of behavioural changes due to BAC, BA’s German operation is currently inferior even to the current LH Group product. If I can’t burn Avios for CE then I’m booking business on LH and it’s usually cheaper and better than CE as well as far more likely to be on time.

It’s a shame that Stuttgart is being dropped but the frequencies and timings were not good anyway and there is still EW if you really must fly that route. Personally, I would take LH to FRA and jump on the ICE to Stuttgart. If you’re heading into the city there’s not that much difference in journey time.