I know it's currently not compatible.. but what if DJI (and Ryze) would make it compatible? (if they want they could do)
It would be great for Tello users who buy also Mini ..

There would be many improvements with that:
using better Wifi transmission from Remote and not from Smartphone, OTG Video, no BT for Controller)

What other users thinks about this idea?

Hello and good day spanzetta. Thank you for reaching out and for these information you have shared with us. As of the moment the DJI Mavic Mini's remote controller is not compatible with the Tello and as of the moment we don't have any information regarding DJI's future products or updates and future compatibility, please stay tuned to the latest news and events by subscribing to DJI official website at www.dji.com or following us on social media ( Facebook: https://www.facebook.com/DJI , Twitter: https://twitter.com/djiglobal , YouTube: https://www.youtube.com/user/djiinnovations ). In addition rest assured that this thread and information will be cascaded to the designated DJI department for further attention. Thank you for your support.

Yes please do this. The TELLO in WiFi is poor. It would make us my TELLO a lot more…only the Mini gets love these days