Unlikely
I very much doubt Three will make a bid again for O2 given the ruling. Even if they're tempted for a hostile bid, costs will escalate for Three, and given that they are not making any new investments in upgrading their network masts/Cells to accomodate 5G, what chance that they would pay over the odds for this Merger/Takeover. (Remember, Telefonica would dearly love to offload their UK arm).
Its game over for Three and will remain a minnow till they up their UK investments/upgrades to make use of the 5G spectrum they hold.
Just read the various forums of how pathetic Three have become. They could have ruled the 5G roost by now, but hey ho ! Dumb and Dumber? Chinese greed, anyone?