wrote

Exactly what service would they propose to Gravesend? Would they
squeeze in the Crossrail stoppers between the North Kent trains? Would
they remodel Dartford?

It all seems a bit vague. I haven't yet seen anything in the Kent RUS
or S London RUS to suggest what they would plan on doing. Maybe I
missed it..

It is vague - as there is no current intention to extend Crossrail to
Gravesend. The safeguarding seems to include more land than was envisaged in
the original Crossrail proposals, suggesting that there will be more track,
especially in the Slade Green - Dartford area, and it is clear that a
terminus at Ebbsfleet has been dropped in favour of Gravesend.

Peter