Tactical voting is probably the biggest danger for Boris. No one can predict that. A hung parliament is still a small possibility.
The Brexit Party and Lib Dems have faded away, but the key target seats are so closely fought. A few thousand tactical voters deserting their party to vote for the candidate that has the best chance of beating the Conservative candidate could be influential.
Personally, I think Johnson will have at least a 28 seat majority, and possibly much more. But I haven't been watching the UK news closely in the period that the polls have tightened. Something has changed, I don't know what, but it seems too late in the day to stop a Conservative win.
