March 29 will not be the date of Britain's exit from the European Union
The date has been extended because the British government is facing trouble in Parliament
It's certainly looking that way, but nothing is set in stone yet. The UK parliament voted by 413 to 202 yesterday to ask the EU to delay the date of Brexit, but the EU have to agree to it, and any one of the member states could veto an extension. Similarly, the vote to reject leaving the EU with no deal was not legally binding, and so currently the UK will still be leaving the EU on the 29th March without a deal. If they agree to a deal in the meantime, the date will be pushed back to June to allow time for legislation regarding said deal to be put in place. Or the EU might grant a longer extension to allow the UK to re-negotiate, hold a second referendum, or even hold a general election.
You are probably right in saying the UK won't leave on March 29, but the date hasn't been extended
yet. A lot could happen in the next two weeks. As expected, the likelihood of Brexit being delayed has caused the pound to rally somewhat against the dollar over the last several days. Also as expected, the effect on bitcoin has been negligible.