There is an assumption that Common Market 2.0 negates the need for the WA.
Maybe we should unpick this.
When we leave the EU we will need to pay off all outstanding EU bills. The divorce settlement. The WA covers this.
When we leave the EU we will need to address the status of EU citizens in the UK and their right to stay in the UK as well as their long term rights. Does Common Market 2.0 cover this sufficiently without the need for the WA to clarify this? It works for NI / Irish citizens fairly well but it possibly does not go far enough for other EU citz given the performance of the UK in the last 3 years.
They would still lose certain rights (for example the right to vote in local elections) as this isn't covered by the Single Market - its an EU citizen right.
There is also the danger as the EU see it, for the UK to use EEA / EFTA on a short term basis to circumnavigate rights and long term obligations set out in the WA by simply using it as a transition phase to a harder brexit.
I note that Freedom from discrimination on nationality: a right not to be discriminated against on grounds of nationality is within the scope of application of the Treaty (Article 18) and is specificially mentioned in the WA.
Also see non-EU nationals married to EU nationals who are covered by the terms of EU citzenship to have rights, which they might otherwise not have.
Also see sections on rights for EU nationals born to EU nationals AFTER exit day to ensure that siblings have equal rights of residence.
The terms of the issues set out in the WA for citizens are lifelong.
Once the UK leave the EU, then the EU have no leverage on these things. I find it hard to believe that the EU will not push for the WA as hard as possible for any deal as a result.
Especially since they felt the need to have a good faith clause in the first place. Article 5 of the WA is as follows:
The Union and the United Kingdom shall, in full mutual respect and good faith, assist each other in carrying out tasks which flow from this Agreement.
They shall take all appropriate measures, whether general or particular, to ensure fulfilment of the obligations arising from this Agreement and shall refrain from any measures which could jeopardise the attainment of the objectives of this Agreement.
The WA also is concerned with our withdrawal from Euroatom. Which all the indicative vote are completely silent on. So whats happening with that? We need to also make a quick decision on that.
The WA is also concerned with the Common Fishery Policy, which is not covered by EFTA/EEA. So what happens with that?
This is just from a quick glance. There is likely to be a whole pile of other issues, which no one has really looked into cos the whole idea of CM2.0 minus the WA hasn't been properly scrutised by people who understand these things far better than me.
Common Market 2.0 as an idea only resolves certain issues which are current concerns but it makes no longer term commitments to EU citizens which the WA does. The EU have said that the WA is important to them and they will change the PD if we so desire.
Think about WHY this is. There is no incentive for the EU to renegotiate and say, yeah ok we'll go for Common Market 2.0 without the WA.
I therefore think the assumption that we can have CM2.0 without the WA, is something of a rather optimistic leap of faith.