Put it this way, The Stone Roses saved British rock music. The 80's were utterly dire for music in this country. Apart from the few bands like The Smiths and Jesus and Mary Chain keeping a small glimmer of hope alive we were slowly drowning in a pile of Stock, Aitken and Waterman sewage. The music scene started to revive with the shoegazers in the late 80's but it was the Roses who done more than anyone to bring British rock music back to the masses and made it popular again. Without them we might not have had Oasis, Radiohead, Blur, Muse, the Manics, Coldplay, or just about anyone else.
Some might not like all of what has come since (I personally am sick and tired of Coldplay inspired moan rock like Keane and Travis) but the alternative is much worse. Can you imagine if the best act of the 90's was Robbie Williams?
On another note, I think Second Coming has stood up very well to age, possibly even better than the first album. I liked it when it first came out but I can understand why a lot of Roses fans didn't. It was a lot rockier and was a fairly big departure in sound. These days we're more used to the idea of a major act radically changing there sound from album to album (I'm looking at you Radiohead) but then it was unusual. I've been listening to it a lot lately and it really stands up as as great classic rock record.
Also, someone dissed the remix album earlier in the thread. I have to disagree, there are some fantastic mixes on there. You just need to remember its more of electronica album than a rock album.
Lesson over