It'll be interesting to see if that actually happens:
1) If you're not actually fighting, you can now just push past instead. You need a Fortified system to place further Exploited ones, but the presence of an enemy Stronghold nearby doesn't stop you doing that. The natural player tendency in Elite Dangerous is very strongly "defence before attack".
2) Because each system is fought individually, Powers go from worrying about 50-150 Control systems each to 500-1500 Power systems each. But we know that the bubble is sparsely populated by players, so a lot of those systems will stay sparsely contested. [1] Are there enough players to actually create conflicts that way rather than mostly stable regions? Will enough groups deliberately create conflicts when at least for a while there'll be plenty of uncontested systems to capture and exploited systems to reinforce?
[1] This is where the effect of this bit is really important (and I agree fully with it)
...does the chaos caused by a large number of pledged players flying around just doing stuff create emergent "overheads" for the more purposeful players and groups to have to reinforce against (like a BGS Anarchy) ... or do people tend to pledge to the power already dominant around their home systems (because a lot of the benefits are "home territory" ones), so the "passing traffic" tends to auto-reinforce systems against attack (like any other BGS controller)
(Or shorter: does it being BGS2 mean it inherits the BGS tendency never to pick a fight you aren't certain of winning?)
Obviously Frontier won't know the answer yet either!