I think this post says a lot, and this guy is from the UK:
"It won't be reversed. If you think it will you don't know modern Spain, Europe, the EU or the European Court of Human Rights. No EU party running on an anti-gay platform will get elected to a majority in any Western European country and no mainstream party will ally with them in the European Parliament.
An EU country doesn't necessarily have to rush to bring in equality legislation but once it's in place, as it is throughout most of Western Europe, to reverse it would be prejudicial under contemporary supra-national laws and treaties. It would be nigh on impossible. It would be a minefield that would bog down any government in legality and appeals and parliamentary governments don't get bogged down like that as they can't function."
One of the main arguments of all sorts of conservative parties around the world is that countries in which gay marriage is allowed are an exception in the global context, and also an exception in legal history: so much for the stability in the future.
You are all assuming that the repeal is something a country would make as a maverick move, and that therefore even if only for a sort of sense of shame, no government will dare do it but, let's be serious and logical, since when a government having the will and power to do something will stop just because of what other countries will think, and since when a country is isolated for a partial blow to civil rights, and that considering that other countries are actually against that blow. Acceptance of homosexuality is still much more a question of habit than of belief for the greater part of population, and even if thousands or a million people went to the streets to protest, it wouldn't change anything.
The key of this question is considering a global situation, in which, just like after the middle 1930s and after WWII the world, beginning from the Western world, entered an era of backward conservatism, we would enter a period in which economic crisis and political unrest after some decades of growth and optimism will allow a darker picture than present convictions would allow to admit or merely conceive. Now it may be not big news to you how weak the EU, even the monetary union, actually is, but this is hardly even the begininng, so don't count on countries who will be more concerned on their own problems and on keeping the whole Union cagebird afloat to, at least, 1992 or 2001 status, to bother about gay rights beyond a mild statement, of the sort they issue when some bad dictator engages himself in actions that the EU or even America won't be able to stop.
Forty five years ago, you could also see coming the results of sexual liberation and fight for civil rights that today we take for granted, and back then there were also millions of people who would argue that acceptance of homosexuality and gay marriage or the election of a black president on the US would tear countries apart, and set one country against the rest.
All the forces remain alive, they are just waiting for their moment, and the naive conviction of the opposite party will help them to get back on track.
