Re linked article: until the cost of strengthening the existing route is known, we don't know if £750M is a good price or not. Whether it's 0.75, 1 or 2 billion I suspect the money will be found, because the political consequences of cutting off the south west from the rail network are unthinkable.
And if the route is moved what happens to those houses currently protected by the railway embankment?
What would be the impact on Dawlish & Dawlish Warren (or Teignmouth) if they no longer had stopping trains in the summer, e.g. The Dawlish Air Show?
And if the new line went inland from Teignmouth to say Starcross (with tunnels) would Dawlish get a new inland station?
If it was my problem I would get a commitment for funding (whatever option is preferred), before the General Election, perhaps during the "kissing babies" pre-election visits