My personal opinion-
As I recall one satellite radio company used booster transmitters on Earth, in addition to their satellites. If the combined company still uses them, in many markets listeners may be hearing a terrestrial booster most of the time. Also depending on how the company uses its available broadcast channel (considering backwards compatibility with existing receivers) it may be possible to use time, frequency and redundancy to mitigate reception problems in moving receivers. And at the GHz frequency used, it may be possible for a receiver to use a diversity antenna.
On the audio side, considering the number of stations offered and the broadcast channel bandwidth, audio quality of the over the air received signal of a satellite radio company is likely to be poor when compared to the audio quality possible with existing analog FM radio. On Internet streaming everyone theoretically has a level audio playing field. But for private, subscription-free over the air entertainment, the existing analog FM system is capable of providing the best audio sound quality to the audience.
Here in the United States the marketplace chose independent, private over the air broadcast years ago. Analog AM and analog FM broadcast provide service to the public with independence, diversity of voices and can do it without relying on a single point of failure, or delivery system monopoly or cartel.
AM and FM provide the audience unique benefits for over the air reception of audio entertainment and information.
After all these years, I still love radio.