In my opinion I don't think there will ever be a reason to fully stop producing this cannon, it is ideally optimized for extreme light weightness, reliability and volume of fire and new technology doesn't really change that. Yes the range compared to drones doesn't seem that impressive but the job of infantry is to get closer to you than is comfortable and these are VERY easy for infantry to lug along behind them with light vehicles.

https://www.dvidshub.net/video/957500/airborne-jump-and-heavy-drop-with-4-319

You can throw it out of airplanes if you want...

https://en.wikipedia.org/wiki/L118_light_gun

It is half the weight of most other similar systems and just as reliable which makes it one of the most formidable infantry tools there is period, especially in difficult conditions.