As a 60yr old player I reckon I will be dead and buried long before level 75 becomes an option.
The sad thing is that BB introduced this new material, in a rush, as they were losing players who had been level 50 for some time. Clearly part of the discussion at meetings would have been how to retain those players. Some 'bright spark' came up with the idea of new levels etc but no-one seems to have though it through fully or the implications to the game.
As soon as XXL came online the level 50's started doing wall to wall FT adventures, paying silly prices for lootspots in the hope of quests for the extra xp which they provide. Soon those players started to hit level 62 and then saw nothing left in front of them bar the daily grind for xp with level 75 a very long distance dream.
So where is the game going? The loss of players will probably increase. Why? The lower/mid-range players who have always relied on the higher levels in guilds for loot spots for quests etc have found that supply has vanished as the 50+ are now working on FT and Alibabas. As a result the game will begin to lose level 50+ who are bored with the silly xp needed for level 75, the mid-range players will become frustrated as they no longer have the old supply of free loot spots to help them along, and the new players will be receiving far less support as the higher level players are occupied themselves.
The only saving grace for the game may be that once players hit level 62 there is no new content beyond that so they may keep playing and go back to providing the in-game support - or they may just quit again having returned when friends told them about the 'fantastic' new content (And lets be honest here, it's not all that fantastic really, a few new adventures, a bit more space, and some extra resource mines - was it really worth all the hype thrown at it?)