I think the very best case scenario at the moment is to keep current restrictions broadly in place while everyone is vaccinated and as many as possible have a second dose. It will still take many weeks for the effect of the vaccinations to take proper effect though. I can live with the restrictions as they are, especially through the summer months, and I suspect many others feel the same.
That is my view too. Keep the restrictions as they are, hopefully weather the inevitable rise in cases and monitor how much that feeds into hospitalisations and deaths, get all adults (at least) vaccinated twice, plus a couple of weeks to take effect, then consider wider re-opening.
I do think there are some possible small relaxations - bring the wedding guidance in line with funerals so it is in line with the capacity of the location rather than an absolute cap, for example, and allow socially distanced singing inside - but not a total free for all.
My greatest fear is a politically-driven opening on June 21st and a rapid retrenchment back to April (or earlier) restrictions.