I don't know - there are a lot of constituencies where the Conservative majority is not that high.
Of course, the Government are planning to make it harder to vote.
What the other parties really need to do is to start work now to identify their voters, potential voters, ensure that they have ID etc to vote and to get them out there to vote.
So many young people don't vote - and they are the ones who are going to be hit by this a lot. Older people are more likely to vote Conservative, are more likely to vote, are more spread out where as younger people tend to be more clustered in big cities, and there are more older people than younger people.
So the Conservatives have a lot of built in advantage in a FPTP electoral system as opposed to a system where the votes just all get put together and the person with most votes wins - like in Brexit.
This is how Brexit parties were able to just to identify voters and get them out to vote. This should have started.