Will this mean that no one will be able to pay to be the default search, or just that Google will no longer be allowed?
Honestly, Google is still the best free search even though it isn't as good as it used to be... and if this ruling means that no one can pay to be the default then Google will still win based on name recognition and performance. Plus they will save money by not needing to give it to Apple.
The real loser here is Apple who is going to lose a fairly large revenue stream.
I imagine that, if regulators go hard enough, it'll make sweeping changes company-wide. Google does a lot of anti-competitive behaviors that don't involve money and are very sneaky, and as a result, we might see a lot of features be changed in the long term.