Unfortunately, there is no time frame for "lengthy-time period". One principle is that Rocket League Season 10 will finish and produce collectively a brand new age of the sport, just like it did while Rocket League (Legacy) Season 10 concluded to then bring free-to-play to the desk. 

The 10th season of Rocket League's free-to-play generation is predicted to begin round April, that means that it's Buy Rocket League Credits  going to end someplace around July/August, in which Epic will then likely screen what is in save for the future of the sport.

However, it is able to be extra well timed than we suppose, as it took just nine months for Fortnite to Cheap Rocket League Credits be transformed to Unreal Engine five (April to December 2022), which means that it could be a lot nearer than we think.