If they want to break blobs, there is a way. Might be a little tough though, but well :
You basically create a system with deadspace pockets (like plexes, etc), with a number scaling. The first one getting into the installation can set up the gate to accept only a certain number of enemies. Meaning, if you are 2 of you going inside, only 2 enemies for example can get inside too (unless you are a little crazy or overconfident), even if their fleet has 2972379[...]832783 members. If you want to get more of your friends inside, you can definitly do it by changing the gate settings. Eventually, the one that controls the gate controls the numbers to get inside (so, the size of the fight). Of course, you can't set the gate to accept less enemies than your own numbers inside.
Of course, for more immersion you can still add NPC ideas where the capture is not based on timers anymore, but on different objectives depending on the kind of plex, much like in incursions : hacking something when you are on the offensive, so defenders would have to protect their NPCs not to make the thing to hack vulnerable, or just capturing a bunker where you have to drop enough marines inside (ofc, you have to destroy the defending NPCs before too), etc etc.
In the end, this would mean that even a single plexer or a solo player can do its part. But to avoid people just allowing one people inside and spreading everyone of their pilots each in a different plex, you can also cap the lower limit depending on the size of the plex : the size (small, average, large, XL, etc), not the type (minor, medium or major). That way you could have small minors, large minors, small majors, large majors, etc.
Too complex ? Maybe. Immersive and less boring ? Definitly. Blob breaking ? Yes.
My main issue with this is that I can't find a solution for neutrals getting inside. The easiest solution would be to make them unable to use the acceleration gates. But is that a good solution ?
I am pretty that this idea, very radical in itself, is pretty flawed in its current state.