So overall I can live with most of the suggestions. Some minor tweaks here and there and this could work.

One big problem I think I have is that these changes make it too easy for hostile forces to reinforce systems and farm fights if they are not interested in actually taking sovereignty.

Especially if the intention is to have smaller entities gain sov, all the big boys (Goons, PL, etc etc.) need to do is send a large roaming gang in that are not easily counterable in <30 minutes by the locals, reinforce a load of systems and they are set 2 days later with tons of potential skirmishes over nodes in numerous systems. In the current system, an SBU takes 3 hours to online, which gives you a lot more time to defend your space from reinforcement and also requires a lot more commitment on the side of the reinforcer.

Seems to me that the defenders deserve more warning than a notification 25 minutes before their low index pipe systems go into reinforce. Hence, some sort of SBU system is still in order I think. Think of a module that anchores in 1 minute, onlines in 1 hour during which it can be destroyed and stays in an invulnerable mode for 24 hours after it onlines or so before it automatically despawns afterwards. Means defenders have an hour to prevent vulnerability to their system and they know they will have to be ready for attempts at reinforcement in a 24 hour window (during the vulnerable period only of course) allowing them to prepare.

Bottom line: you need to have a chance to actually prevent reinforcement of your system, much like the current SBU system. 20-30 minutes is too short for a serious fleet formation and impossible if the locals already have large roaming fleets out. (This new systems disencourages roaming!)

CCP,

In order to prevent abuses and griefing please restrict the use of Entosis Link to Capital Ships. If a group or alliance wants to mess with someones sov make them commit seriously.

I wonder where the CSM stands in all of this. There's only a single post from them in this thread. Considering the significance of the matter, some representation may be appropriate?

While the current sovereignty system worked fine for many years, we see the need for a fundamental overhaul.

We are excited to present the plans for a new sov system coming early this summer including:
1) No more grinding through hitpoints
2) Meaningful combat events distributed over the whole constellation
3) Space activity results in defensive bonus
4) Designated daily "Prime time" for alliances when their structures become vulnerable

Read all about this new sov system, the mechanics and the fine details in CCP Fozzie's latest blog Politics by Other Means: Sovereignty Phase Two!

While the current sovereignty system worked fine for many years, we see the need for a fundamental overhaul.

We are excited to present the plans for a new sov system coming early this summer including:
1) No more grinding through hitpoints
2) Meaningful combat events distributed over the whole constellation
3) Space activity results in defensive bonus
4) Designated daily "Prime time" for alliances when their structures become vulnerable

Read all about this new sov system, the mechanics and the fine details in CCP Fozzie's latest blog Politics by Other Means: Sovereignty Phase Two!