While possible, I think the issues in Nigeria are different than in countries with strong property rights. From what I hear, the reason why wireless/mobile internet is so much more reliable and popular in Africa is that with wired internet people steal wires that are hung on utility poles. Not sure if they would also dig up underground wires, but obviously burying the wire has more associated cost than hanging it from a pole.

I even know of a few people in Copenhagen who've done that. Companies are starting to offer all-inclusive packages for mobile+home 4G, where you can add a fixed wifi router onto your existing mobile 4G plan. If you're already paying for mobile 4G, the incremental cost to those packages is often considerably less than the cost of home cable+DSL, at least if your data usage is moderate.