Maybe liberal democracy is not the final outcome of human civilization. You like it and I like it (presumably we were both raised to believe this way) but perhaps it's not really true.
Just to question a base assumption here.
It seems to me, if all the things that are claimed to threaten liberal democracy actually do, liberal democracy might be much less robust and long lived then previously believed.
[EDIT] One thing I no longer think has any realistic future is the open, semi-anonymous Internet. We're either losing it because despots take over and definitely won't permit that threat to remain unfettered, or we're losing it (in perhaps a gentler-touch way) because we have to to prevent authoritarian take-over and vast civil strife. I don't think we're getting to keep that no matter what happens.
Even the "good guys" will call emergency that will never end.
Oh well, it was nice while it lasted. An intellectual Cambrian explosion. And all that porn!
On that note: I can't wait for the resulting proliferation of photorealistic tentacle hentai. Imagine the possibilities!