The issue is that doing this is forcing the issues of a few people on to a much larger set. If someone doesn't want to write code for that browser just don't. I

The issue is that doing this is forcing the issues of a few people on to a much larger set. If someone doesn't want to write code for that browser just don't. If they're feeling really nice, pop an error message telling them that their browser is expired. Oh, whats that? now the site isn't going to bring in as much revenue? Now they have a choice, whether the revenue is worth more to them than writing the code.