The topic started by El Tigre is aggresive. Why do we need to highlight and emphasise differences? Yes, there are always differences, even between people living next door, belonging to the same ethnic group and you can find similarities between between people who have nothing in common culturally.
National identity is about what we think we are, no doubt. Same applies to belonging to language groups. If we think we are Slavs, we accept the fact that we have similarities in languages and traditions, show interest in these similarities and in other similar nations, then it all makes sense.
The war in Yugoslavia has created a lot of hatred between similar peoples and many are now trying to highlight how dissimilar they are. It will take a long time before the hatred is reconciled, IMHO.
The term "Slavophone" may apply to people who don't belong a Slavic group but speak a Slavic language, for example Jewish people living in Russia (for many of them Russian is their first language), a large portion of russified nationalities who lost their language or Greek Macedonians (or rather Greeks, speaking a Macedonian dialect) or any other native who speaks a Slavic language as their first language for whatever reason but who don't consider themselves belonging to a Slavic nation but by no means to Slavs themselves, unless we want to say that Slavs, among other things speaks a Slavic language.
Slavic languages and people speaking them have been classified long ago and I don't see reasons to change it, even we take into account current or past hostilities between some of them.