Tipi field has been there for yonks, and adds to the iconography of the place, at the price they sell at them it helps to subsidise GA tickets anyway.
Worthy View and Stiklinch are offsite, they aren’t really even glamping anyway but again they help subsidise the GA ticket cost.
All other Glamping like Love Fields, Pop up Hotel, Windinglake, Camp Kerala are offsite privately run enterprises. Some of these get access to hospitality tickets to sell on to rich punters to keep them sweet (which helps everyone) but again this has no impact on space within the actual festival, and neither does the hospitality ticket allocation as that exists as it’s own entity regardless.
if the festival added 2000 glamping spaces inside the fence, then yes that would ever so slightly diminish public camping, but other than you cooking that up as a scenario, I don’t see anywhere where it’s suggested or stated that will happen?