Earlier quoted context omitted.
Don't pretend your opinion is any more valuable than an opinion of any of the other 27 members. I'm an outsider on this, but I could imagine this as an effective quote to replay in any "leave" campaign. Can we really imagine UK (or Germany) ever being relegated to having only the influence of e.g. Slovenia?
Countries don't have direct representation, political blocs do. Each country picks its own members (at minimum, six of them in the European Parliament), those members congregate into political blocs, those blocs make proposals, build a majority within EUs regulatory bodies, and adopt changes. The difference between Germany and the UK is that German parties recognize this process and follow it. UK's (right-wing) parti…
I don't share your gleefully grim expectations about UK's economic outlook. Sure, EU customs will be an issue. Making it too big an issue doesn't seem to be in anyone's interest, however. I can't imagine that e.g. Ireland want to hurt their own economy through any sort of "work to rule" policy. I can think of one EU member as important to the overall European economy as UK is (and it ain't France).