The CAA is just rubbing it in now. Replacement buses are certainly a good economical idea for multi-frequency overland routes like Scotland-London, and well doable within fares already paid. The list of other airlines, shown in the press that CAA had berated in the past, contained only non-UK based airlines. Giving the impression they have become a bit protectionistic, helping their own national airlines milking the issue with the nit-picking about the 3x limit. If alternative flight costs goes well above original paid Ryanair should be in its full right to look at alternative forms of transport. But the media is of course all full of people that think they will be bussed from the UK to Mallorca or Greece.
Ironically in this case then Uber drivers might replace pilots after all.