I honestly don't think we should be looking at a transition period at all. Until we leave we have to abide by the same rules of the EU and still have free movement, which will increase of Islamic terror attacks in the UK.
We will also be paying a divorce bill which is said to be around 20 billion, this i saw in the independent. I don't see why we should pay any more to the EU as we have paying into their system for years. That money that is to be paid now can be used on NHS. Yet again the government surrender to the EU rather than helping their own people.
Another thing to add, until we leave we will not be able to make any trade deals as we will still be part of the single market. We will still be ruled by EU laws and the ECJ will still have superior powers and rights than our own court of justice.
This is not the brexit the people voted for. This is being done so that when it gets close to the date of us leaving, the government will try to force a new referendum on brexit and make the people vote remain. This is what it is simply about.
If it were me as PM, the UK would be out of the EU by now and would be trading with the rest of the world.