I've had a better idea - keep Crossrail 2 but make the Watford DC Line
a branch of it!

The central tunnel from Clapham Junction (or wherever) through
Battersea, Victoria, Piccadilly Circus, Tottenham Court Road and Kings
Cross would remain unchanged.

After Kings Cross one branch would continue to Dalston Junction,
Hackney Central and onto wherever this branch is going. Another
branch would go to Camden Town, and then takeover the Euston -Watford
DC Line (which would no longer go to Euston - passengers can change at
Camden Town). The Bakerloo Line would be cut back to Queen's Park.

Euston already has good connections to Victoria and Waterloo, and so
does not need better links to Clapham Junction. Going via King's
Cross allows more places to be connected to the CTRL. Euston -
Watford DC Line passengers for the Northern Line can change at Camden
Town, while Victoria Line passengers can change at King's Cross.

* Improved service on this line.
* Most northern options involve diverting lines away from the City
(and with the Epping branch away from Stratford for Canary Wharf),
generating a huge amount of interchange. With the Euston - Watford DC
Line no such diversion is needed.
* Direct link from CTRL to Willesden Junction (and Park Royal area),
improving regeneration potential of the land there.
* Improved links to the National Football Stadium at Wembley,
including a more frequent link to the West Coast Main Line at Watford
Junction. It also makes land at Wembley more attractive for
redevelopment.
* More rail capacity at Camden Town, with new journey opportunities.
* No stations would have to close (with Crossrail 1 South Hampstead
and Kilburn High Road may have closed if this line was part of that
scheme).
* Relief to London Euston.
* Relief to the Bakerloo Line.
* Relief to the Metropolitan Line.
* Relief to Crossrail Line one between Paddington and Tottenham Court
Road.
* Relief to the North London Line between Willesden Junction and
Camden Road.
* Possible relief to the North London Line between Camden and Dalston
(tickets are cheaper on Crossrail 2 with Oyster prepay, line is more
frequent, fewer stops - although one cross platform interchange) If
not relief then mopping up of overspill passengers.
* If Crossrail 2 is to be a tube line, the Euston - Watford line is
fairly segregated, making it easier to incorporate the line into the
scheme.
* Some people may be upset at the loss of the Bakerloo line, however
as there would be less stops between Queen's Park and Tottenham Court
Road via Camden Town than via Bakerloo line and Crossrail 1, Crossrail
2 offers a quicker journey for most people. People can still change
at Queen's Park for the Bakerloo Line.
* Allows Class 313 trains that currently operate on this line to be
reallocated, strengthening services on other lines.