I'm at the age where I can afford this kind of perspective. Although I won't admit liking it.

The Trek fans who flailed and hated (and still do in certain quarters) are getting older. TNG fans, who often felt overwhelmingly negative about Enterprise to me, are now beginning to have to defend
their show because after thirty years even
it is looking dated and a bit drab. (Draping an entire series in neutral colors will tend to do that, but neverfear, everything old is new again eventually.) It's not so fun to be on the receiving end of fandom disgust and negativity, and not to say that's the only reason but I'm sure it may have something to do with it. Takes a LOT of energy to be on the defensive, even internally.
Also, watching the influx of both NEW and "new" fans to Enterprise over the last decade, as well as the rise of social media which make interests even more transparent and easy to find over a broad base (Twitter and Tumblr, for example), it's been an absolute joy to see people who either don't know about the earlier hate or don't care. I cannot tell you enough how difficult it was to be a fan and enjoy the show in the first two years, unless one had a strong cadre of like-minded friends from... somewhere. I was lucky enough to find the right places at the right times, and at the very beginning of broadening use of social networking... YahooGroups, LiveJournal, AIM... as well as lucking into a bunch of crazy wimmin to nurture me at a time I really needed it.
But it was also painful to watch a few of the early adopters not only turn away, but begin to actively criticize and grouse enough to make me doubt my own enjoyment. I'm still in touch with some of those folks, mostly through LJ, and I genuinely care about them. But I don't have a lot of fannishness in common with them anymore, and that's a dimension I miss.
The resurgence in interest, I think, has a lot to do with the newer generation coming into fandom in general. Fan fiction is not only accepted now, it's almost a rite of passage for geeky girls (and guys? I have no idea.) Comics are huge movie fodder. Slash is almost mainstream compared to ten years ago. Same-sex marriage, polyamorism, bisexuality and all the wonderful letters of GLBTQ et al are accepted by the young as simply a part of life, and allows them to explore their own place in it much more easily. For geeks, it's usually through a fannish thing.
So Enterprise is well-placed to be rediscovered by people who, ironically enough, have fewer preconceptions about the show to work through. They see the show, they like the show, and they easily find others who feel the same way. It's closed canon, they can't be Jossed, and there is an entire decade of world-building from those of us who really have gone before them.
Gives me hope, it does.