Except post-EU the UK will likely continue to bring EU migrants in anyway. They generate money for the economy and they fill jobs that British workers can't. They also offset the ~300k British people who emigrate to countries like Australia and Canada, as well as other EU countries. None of this is likely to change. These countries will still let British people in and the UK will still let migrants from all those countries in, guaranteed, because it's good for the economy and no government that wants to be in power will want to tank your economy.
You can see above that net migration is actually generally less than 200k a year already.
You are simply living in an absolute dreamland if you think that leaving the EU will help start off a process to get rid of those pesky immigrants that you so badly want to, because it won't. Regardless of what government you get after the UK leaves, and regardless of whether you think they'll cut migration, they more than likely will not, because they need it for a functioning economy and no government wants to rule over a tanking economy because it's a nightmare for them.
You talk about remainer's being smug yet you (and many other leavers) have trundled into this thread time and time again with your ideologies about a post EU UK and what it will entail, only for it always, always to be proven nonsensical with pure facts, and yet you trundle on and on without presenting any of your own facts to support said ideologies. It's no wonder people get frustrated with that.
It's quite simple really, you voted on the basis of something that will not happen. It probably was reasonable to believe that could happen back in 2016 when you voted to leave, so nothing wrong with that, and I certainly won't begrudge you voting to leave if that's your opnion (even though I massively disagree with the idea that immigration = bad and it needs to be curbed), but almost three years later when it's being shown that what you voted for is not going to happen, you should really accept the facts instead of repeating the same thing over and over.