@Old_Observer
In the case Eritrea the State that it was breaking away was not a failed state.
In the case of Somaliland, it is unique in many aspects. This is the only case where one of the two partners in the Union was no longer able to function. The first formative years after Somaliland declared indepedence were very crucial and, in hindsight, cemented the next 20 or more years' foreign policy towards Somaliland.
This is in relation to America's crusade to restore Somalia in the early 1990s and later Egypt/Saudi's attempts to use the UN to restore Somalia. These two events barred Somaliland from gaining any traction in its independence drive. This was largely to do with the fact that Somaliland was not an sponsored project like South Sudan was or Timor Lese. Had Somaliland a friend with political clout i.e. UK, championing its cause in those formative years, that situation could have been very different.
After both the US's Restore Hope and UNSOM failed, the world was disinterested in anything to do with Somalia/Somaliland.
The issue is very different at the moment. Despite those old roadblocks still exist, however, Somaliland has proven many of them wrong. Hence, today Somaliland enjoys respect from those same powers that used to pressure Somaliland participate the many failed Peace Conferences. Today, no one pressures Somaliland.
The same powers now are pushing for a settlement through Talks. That is where it is at the moment.
I have very little doubt that Somaliland will gain its independence.