From all the reports I read, the Main stand will be ready in 2016 with the ARE being ready as early as 2018. 5 years after 2013 (which, based on estimates of cost and the feet dragging of the council may or may not actually have been met if we decided to go ahead with it.)
60,000 isn't too bad at all, it's just the right sort of size for us right now. 10 years down the line if we continue to win, then we may require an extra 15-20k. Which, if we plan for them now we can continue to buy houses and the land around the Kop and Centenary stands with a view to adding that extra capacity.
In terms of a new stadium, the fans would be further away from the pitch, the location (if put somewhere other than Anfield) would turn a lot of fans away from the club, supporters do not like it when a club moves away from its home. Going from Anfield to the docklands would just alienate a whole swathe of fans and potentially cost us in revenue and image.
It was always going to be the most happy solution for most people involved. We get to stay at Anfield, where we've been for over a century and have the extra capacity and mod cons to support the team financially.
Anfield should also have an increase in grading now, so maybe we'll be in contention for European finals - which would provide income also.