Probably, but to the train company, or central government who owns the risk in this particular case, it’s the total revenue stream that counts, not the fare per mile to the passenger, given trains, tracks and driver are there and have already been paid for regardless.
Secondly, for people with season tickets from Forest Hill, a disproportionately higher share of this fare will go to TfL anyway, because of the frequency of the Overground and also the travel on tube and buses that’s covered.
It’s mainly the former, but as said, there should be a London Bridge train about every 15 minutes again from May.
Not sure if anyone has approached the MP (Forest Hill Society may have?), but it is fair to say that she has been very engaging with the Crofton Park user group (aka A Cindarella Line) which appears to have had great success so far, and she has also many and actually mostly Southeastern commuters to worry about. I think since the introduction of the Overground services our line is sometimes considered as having had its fair share of recent improvements already.
Interestingly, I (and surely many others) had a Tory leaflet in the letter box the other day promising a campaign for better Southeastern services to help people in LB Lewisham if elected. I’m not sure how they think this will buy them any votes in Forest Hill, but they probably didn’t think at all and I’m not even blaming them here, but it confirms the point further above!