Re the Blackpool - Crewe idea - yes please! (Actually, Blackpool - Birmingham would be even better).
I have no idea what the market for Blackpool/Midlands is, but last time I came back from Birmingham the scrum at the doors closest to the subway had to be seen to be believed, as a good couple of dozen people raced over to Platform 1 to board the 150 we'd passed between Leyland and Preston. They were watching it online, and many clearly did this regularly.
Connections to Blackpool can be erratic; services from Preston tend to be hourly but they're made up from multiple routes and the gaps between trains can be variable: e.g. departures at 15:34, 15:38, 15:55, 16:34, 16:38, 16:55, 17:21, 17:32 - times are all over the place, and anything from 4 to 41 minutes apart.
The whole thing feels cobbled together!