Your pension will have to go into some sort of annuity but what will be available in the future is another story. The reason for putting it into an annuity is very simple. In the past, people claimed tax relief on pension savings, and saved a good amount. Then some people retoired, cashed in the pension pot, blewed the lot on valuables, the house or holidays, and then claimed benefits because they had no pension. Now, pensions that attract tax relief have to be used for an annuity to provide a pension.
ension saving is becoming mandatory because many people who could have saved didn't, preferring to depend on the sale of their property or other assets for a pension. Unfortunately, many of them just claimed benefits instead. This is the problem the government is trying to solve.
I think it will be difficult to opt out, although what opting out depends on is still a bit of a mystery....maybe already having considerable pension assets etc.
As to claiming benefits in future, mandatory retirement at 60+ is being phased out rapidly, and therefore you could be asked to find work until you drop if your pension is insufficient. My 46 yr old son believes that by the time he retires, state pension will have shrunk so much as to be almost worthless, and is planning accordingly. I can believe this - soon there will be only two workers for each pensioner, which will be unaffordable if we do not ake action now.