I think you may be wrong about the use of anti-drone EW. It is already in use, and the drones are getting through. Recently was a video of one dropping grenades on... a RUS anti-drone EW setup.

EW can jam control links, which can reduce drone effectiveness. It can jam GNSS navigation, to some extent, except both sides need the GNSS, and selectively jamming it requires either close proximity or large directional antennas.

But drones can counter this with inertial measurement units and pre-programmed flight paths. They can also fly high and be hard to detect (for example, using low-probability-of-intercept spread spectrum radio). For artillery spotting, or relaying commands to suicide or bomber drones, this can be effective.

So while counter-drone measures will reduce their effectiveness, I think they still have dramatically changed land warfare.

And then we have the recent surface vessel drone attacks at Sebastopol. That's another potential game changer. As best I can tell, they used StarLink for the control link, and their radar cross section is so small they were able to venture deep into the Sebastopol Naval Base without detection.