It is only TEMPORAILY!
I think it's a good idea to have a temporary ride like Power Surge until COVID-19 has finished (no physical distancing or any other COVID rules). And once Luna Park can get more money again by concerts at the Big Top, and hiring out Crystal Palace. Then it would be a good idea to start looking for rides. And even if there was no COVID-19. You would have to wait though the planning permissions. And the complaints from the neighbors. So having a thrilling, safe. But also cheap, and temporary is the best way during this period between rides.
And if Luna Park after the contract is over isn't ready to get a new ride in (maybe because of COVID-19 or planning permissions, or the neighbors). They can always get another ride in for a little bit or use a different company. I think Space Jam (if the neighbors are okay with it) would be a perfect spot for now where Moon Ranger used to be! Also maybe Hurricane, or Roundup, or Body Rock would be good for now. I would personally like to see Hurricane there. And maybe also bringing back Pirates Revenge for the Summer? There's quite a few choices. And when you are looking into a permanent ride. There's tons of choices!