I am sure there are passengers like me who were tiring of the airport experience already, and adding testing to the list of things to remember was the straw that broke the camels back.
My last trip to Scotland, normally by air, was by train even though it cost more. The day time services by rail were fully booked.
"Rail and Sail" to Ireland was already broken so was never that much competition but I can confirm that I know lots of people who won't fly until the experience is easier