Maybe? I get what you're saying, but the confusion of the past 2 years of negotiations and the magnitude of this vote's failure is a pretty strong indication that it'll not be possible to 'Brexit in name only'. The nationalist side will (correctly) point out that if you're still subject to the same regulations & trade deals, you haven't actually changed anything. The EU might go for it, but would probably be like "If you're going to say that you're not part of the EU, we can't realistically give you a voice in shaping EU policy", thus leaving Britain in a worse negotiating position with respect to those trade deals. I thought that was the grandparent's point.