Now that Eurostar has been running the full length of HS1 and has been
serving St. Pancras for a little over five months, who was right?

Did all of the people living in areas reachable from, via or in SW
London who used to go via Waterloo give up and go to Gatwick? Did
swarms of people that once stuffed themselves into the Underground and
Thameslink to get to Waterloo from Euston, KxSTP and Liverpool St now
just walk up to the St. Pancras turnstiles?

I'm curious to know if any hard data exists on how precisely the
ridership on Eurostar has altered as a result of the switch to St.
Pancras.

Also, as an aside - will the minimum UIC B+ structure gauge be taken
advantage of anytime soon by larger HSE-conforming TGVs anytime within
the next 10 years?