This came to me in a dream. Seems like an interesting idea, so why not see what the community thinks.
The concept would be to allow an attacker to capture a structure (citadel) intact.
How would it work?
In last 10% of structure allow a citadel structure to be hacked with an entosis link. Successful hack results in the structure turning over to the corp of the player who hacked it. The attackers are now defenders until the timer expires and the structure repairs. This would also transfer any items in any corp hangers within the structure to the new owning corp as a delivery. Player items would remain theirs in the structure.
The defender is faced with a few choices. The defender can kill the attacking force and hacker or force the attackers to destroy the citadel or allow the attackers to take it whole by not stopping the hack/entosis link.
Assets in the structure could be affected by security level of the system or maybe not… Say even low-sec and high-sec corporation hanger items are lost, but with the current system and thoughts for Low-sec and High-sec those items could be kept in the citadel under the initial owners then use the asset safety system already in place.
Even if corporate assets aren’t moved to the new owner corp, the prior corporation and players who had items in station would lose access and be forced to wait for asset safety.
I believe this would also affect the number of structures deployed across new eden as attackers could hack the structure, take it over and pull it down. By taking the structure down it would increase supply of citadel structures and modules to the market and also potentially removing more of the “clutter”. Noting, if the citadel was returned to market it could be deployed again (increasing the clutter).
However, this mechanic would make it more profitable for corporations/alliances to attack and capture vs attack and destroy and overall simply attack structures, increasing PvP in High-sec, Low-sec.