Yeah, that's a possibility. You've still got to ask what will it achieve though? The WC will still take place - as did the 1980 Olympics when the USA pulled out. That was more damaging to the prestige of the event and it had **** all effect on Soviet foreign policy. Plus for us they'll be consequences. FIFA and UEFA have never particularly liked the English FA (and a 100% Remain vote wouldn't have changed that) and would gleefully take the opportunity to impose sanctions on us for boycotting one of their competitions. We'd end up losing far more than the Russians would, which would simply increase the smile on Putin's face.How about we announce the boycott just before the game is due to kick off? They're going to have to have meetings to decide who should be invited, then get them all to stop drinking and get themselves ready for a WC and fly to Russia. Nah, they'll just have a group with 1 less team.
I've never been a fan of gesture politics or virtue signalling, and this proposed boycott is both. The best solution (although an admittedly impossible one) would be to win it, and snub the presentation ceremony, or all wear shirts with Skripal's face on it*. Yes, that would bring some sanctions (like the Poppy affair), but not as severe as say being banned from competing.
*Yes I know that's gesture politics as well, but it's only a small one. I can live with the contradiction!