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A PvE "friendly" Cyrodiil idea I think most everyone might accept
a siege from a sizable force would require the local PvE players to take part in the defense, or lose out on their local Quest/Exploration access until retaken.
At which point all the PvEers who didn't want to PvP in the first place will simply forget about Cyrodiil quests, just as they do now.
There's a reason why ZoS dropped the restrictions on getting into IC - that idea was abandoned, and you're asking for essentially the same for quest access to Cyrodiil.
You simply cannot make people PvP if they don't want to - and if the whole of Tamriel became open map PvP then people would leave in droves.
If I'm doing stuff then I don't want to have to stop to fight you just because you want me to.