I think in a couple of months we'll have a resurrection of the whole herd immunity, get em back to the offices debate.
The argument will be - we're vaccinating the vulnerable, but rather than wait for the under 50s with no underlying health conditions to get vaccinated, they should go back to life as normal as the death rate is low for them anyway. The virus will then circulate rapidly among them but it will build immunity hopefully without the hospitalisations and deaths that will overwhelm the NHS.
The problem with this argument will be the people who get long covid symptoms and become long term users of the NHS and are compromised in terms of being able to work. Employers will likely be pushing people to get back to the office but then if they get long covid symptoms and have time off sick we will start hearing about 'UK workers taking too much sick time" (no doubt with provocative Daily Mail comments about this being the new 'middle class excuse disease') and employers will show them little sympathy and kick them on to the benefits system.
Also given what a cock up they made of test and trace I wouldn't be surprised if this vaccine roll out ends up riddled with delays especially once a private contractor gets involved with the distribution and it all gets screwed up. The UK now is starting to resemble a developing country where you get a plan for some logistics or health project like building water systems or rolling out a vaccination programme, aid money comes in and development agencies are on the ground ready to deliver it, but they have to deal with the domestic government and the money gets siphoned off to some contractor with contacts in the relevant Ministry, who is more interested in benefiting personally, and the underlying project gets screwed over.