EI will have to be more competitive on their fares. A recent flight from SFO / DUB only had about 60 PAX. Doesn't seem like a successful entry to a new market.
You're judging a route on one flight? Interesting.
Also SFO has been operating for nearly three years, it was restarted in April 2014 so hardly an entry into a new market. All the evidence points to the route being very successful, daily within a year, increased frequencies in winter within two years and upgrading to A333 ops this year.
If the fares are too high for you, there's probably a reason for it.