It's not like there's a flood of people needing the access to Whitefriargate. That should be the burning question - what to do with what should be a main shopping street? Personally I'd say open up to local, new start traders offering an eclectic range of products / services making it attractive with a 2 year rent free option.
It's disappointingly unimaginative, option 1 will obviously win, as people don't want it filled in, but it's really little more than a tidy up of the rubbish that's there at the already.
I know the Council were contacted by several people suggesting doing what they've done over the Roman ruins in Malaga... please log in to view this image
On what there is there, it doesn't seem to be a practical option due to its size and viewing options.
The pyramid option works if you only leave exposed (and light) the square foundations of the gate tower, it's more about telling the story anyway.
Can't see it myself, seems like the worst of all worlds on that site, but it's not an option anyway, unless private individuals want to fund it and any consultations and maintenance.
I was just saying what I think they should have done (though I'd have glazed it flat, rather than under a pyramid), but it's obviously not going to happen now.
There's lots of ruins all over the world that simply have a glass floor above them and I'd only leave a square visible over the original part of the gate tower... please log in to view this image
As I said, not a pyramid as you originally suggested then. Your ammendment would only really work if it was only partially enclosed, or it limits the use of the whole thing. Enclosing it brings in alsorts of other problems. They could explain why this isn't an option either.