What Starmer is doing on exit strategy is taking the risk that pain *today* over talking about exit strategy pays off when a) a lockdown strategy put together behind closed doors falls over or b) when politics becomes 'how do you pay for it?' https://www.newstatesman.com/politics/uk/2020/04/why-keir-starmer-right-push-debate-government-s-lockdown-exit-strategy
Will it work? IDK, ask a magic 8-ball. You can look at how he navigated Labour's internal divisions over Brexit, during which he was at various points castigated by every part of the party, and his position now and draw one conclusion: https://www.newstatesman.com/politics/uk/2020/04/why-keir-starmer-right-push-debate-government-s-lockdown-exit-strategy
But you can look at the 2019 election and draw another. https://www.newstatesman.com/politics/uk/2020/04/why-keir-starmer-right-push-debate-government-s-lockdown-exit-strategy