There's a lot of potential. I saw a post on FB awhile back calling for the creation of the "Sgt Pepper Line", which would incorporate the Canada dock link and an "underground" station at Bank Hall.
I think I've mentioned it before, but what I'd really like to see is a re-establishment of an Overhead Railway.
Not as a simple replica, but like the OHR was when it was built, something really innovative.
Why not a high tech monorail into town from JL Airport and running to town and then up the coast up to Crosby way (and a park and ride situated there to serve visitors to town from the North), perhaps with a a 'Y' link serving Anfield or to an interchange. Like the DLR, they could be driverless and running every 10 minutes or so, perhaps even less at peak times, a sort of in the air and above the roads tram concept.
While I love railways, I think running passenger trains on a line sharing the projected rail traffic from Liverpool 2 could be problematic.