Ingenuity is just the very first step. The future of taking drones to explore Mars - or even to another planet, such as searching for microbial life in the clouds of Venus - will be exciting. We all know that the leading military powers are investing heavily in drone technology. There will be spin-offs from this, including better drones for space exploration.
The size and weight of a drone that needs to be part of a space vehicle or payload is a crucial factor - at least, until SpaceX's Starship is fully operational (and, even then, every kilo or lb will have to be justified). The fact that DJI are making smaller and lighter drones is a clear sign of things to come.
It probably won't be far off that we'll be anticipating the landing of a more stationary lander, equipped with one or more drones, each capable of flying and taking/drilling for soil/rock samples, then returning them to the lander for analysis. This might prove better than a rover.
And that's without getting into the Breakthrough Starshot Initiative and questions of "Is it a drone? Or is it a probe or nano spacecraft?"
Could we be being watched from afar via tiny probes? If there are 1,000,000,000,000,000,000,000 habitable planets out there in the observable Universe, - and we're relative newcomers in terms of intelligent life (allegedly intelligent - please listen to the last line of Monty Python's Galaxy Song) - the mind boggles at what might be realistically possible.