Something they have to stop doing is adding more big islands. Ultimately, if the goal is to get more people on islands, adding islands that only a smaller subset of players can afford isn't going to help. Granted, with the increase in points, that helps, but that also just made other problems worse, since they gave all companies more points. Ultimately, all it did was put more pressure on the smaller island ownership and we still have unowned large islands.
You cannot give a solo player enough points to hold two entire islands alone (or is it 3 or 4 now after the bump?). Having a second island, regardless of company size, should be a high bar. You have systems in place to encourage outposts (especially without the nuke) on other people's / Allies territory.
Larger companies should be incentivized to hold larger islands, but right now that isn't the case. The biggest islands just aren't worth the trouble. If they offered More diverse resources (say the 100+ point islands had 2 or even 3 variants of resources), allowed a higher tax rate (30, 40%), had a higher chance of maps spawning, or better map quality (to give more passive gold generation), really anything. But right now, holding 2 smaller islands, to get resource variety, drastically outweighs the value of holding one bigger one.