Between nil and zero. Just because excel is "bigger" by various metrics, does not give MS any more ability to quash Python. The software world is way larger than it was in the heyday of EEE.

Excel still has a fraction of the power Python does, it's not becoming "de facto" anything that it isn't already de facto for (which is highly interactive data wrangling and making reports by folks who cant/won't use a python env for that task).