This isn't a Brexit thread. I can see that there's some overlap but we don't need to hash out the arguments that are general to Brexit rather than specifically any which apply to Eurostar. Please ensure that you keep to the topic thank you.
Respectfully, and I appreciate of course the mod comment is general of course, my specific response was to assist where it had already drifted and was providing clarification which is of relevance to current UK border entry requirements and so Eurostar too rather than B. in general.
I agree that we collectively need to row back towards the topic on which it is very simple IMHO:
1) further expansion will be very limited given the requirements for traffic entering the UK via the tunnel to have been security screened in a sterile area and Border Force not been overly keen I understand on further staff being at juxtaposed posts - that of course buts up against the UK desire to have juxtaposed checks in the first place.
2) Even if there is demand/a will, the issues at 1 cause significant issues at stations within Schengen e.g. can you build the infrastructure, how much capacity do you lose etc. Look how long it has taken with Amsterdam/Rotterdam. If you are looking at only a train a day you get the Lille shuffle issue absent building quite significant infrastructure for very little gain, even if we all would love these connections here on a Rail Forum.