Will be great on launch -> People will hit grind endgame and quit -> Since its a forced sub people won't come back as easily -> Swap to F2P with selling motes in cash shop similar to other games. For me I am ok with it because there really isn't a lot of games doing this (Officially) Solo style MMO, and since its EQ I am a sucker for it. The only other time I subbed <I quit subbing during GoD, and played on test> for EQ was Mischief server since it was doing things different enough to warrant a cost. So basically the same to me.
I asked a friend of mine who only played EQ2 and was looking at a game to play and she turned it down simply because they never played EQ and a Box + sub cost was too much to invest to test to see if they like the game. No, they aren't poor.
It sucks they didn't go buy to play route with cash shop all around. If they went GW2 route they could continually sell Kunark for years <Same way you buy Heart of Thorns today> I think they would have made bank with it, but it is what it is.