[JAS84]

It would definitely need a coloured background now instead of plain black. Think about how Central's idents evolved. The first cake in 1985 was similarly just coloured blocks on a black background. Later versions from the 90s had different backgrounds and textures. If Channel 4 did something similar, that would still work today.

Less 'real life footage with a logo slapped over it' style idents.

There isn't much of it these days, its heydays were in the mid-noughties

BBC One and the ITV channels currently use that style. So do most of the Sky and UKTV channels.