It has nothing to do with defending it or it dies…
Your idea(s) do not take into consideration:
1.) That POS are going away, and most corps in highsec can not be on 24/7, even the mercs if they had structures in their name with sufficient numbers to not lose something because they need to sleep, take care of family and a host of other things.
2.) Again, the fuel problem…Losec groups of any relevance are mostly PvP, they dont have time for Ice mining and crap like that. And in Highsec even using local fuels its already PITA and a full time job if you make the game a job instead of a game to gather fuel resources.
3.) the Tethering without fuel mechanic is fine, in nullsec only known friendlies with docking access have this ability. In highsec this ability allows for types of meta-politics/meta-intel to take place, without you would be stifling gameplay and styles even more.
4.) EvE at its core is about social game play, Citadels, the defensive structures should take time, resources, and be hard to kill (as in grind if nothing else).
Really your idea does not take Highsec into consideration, or smaller groups (50 or less players), all it does is to ensure structures will never be a thing for anyone but a Large Bloc Alliance in control of it or a Large Merc Coalition standing behind it,
Your idea is total rubbish…but with the advent of POS going away, if you want to make it so no one puts these things up with intention of reasonable use and there fore killing the game sure by all means.
Otherwise really? please go stuff yourself and your lazy anti-social aspects into a chest and launch it into the EvE Gate.