The New Haven was dead even before PC got to it...
Between corruption in the management, some experiments that turned out only to be a loss of money, confusion over whether electric trains or diesel trains should be run, decaying equipment, loss of service, the highways, the airlines, decaying track conditions... the New Haven was forced into the Penn Central merger by the ICC because even though it was a little rough around the edges, there were still essential parts of the railroad that would cripple interstate trade and hurt other passenger and freight industries if it were to just give up and die. In fact, the PC never wanted the NH, the only reason the NH merged with it was because the ICC demanded it. Service was slow over the Maybrook Line and the Poughkeepsie Bridge had been reduced to one track anyways so when the bridge burned in the 70's under the PC, it didn't really make a difference. The NH had minimal traffic over the bridge as did the PC when it took over. The fact is, the bridge wasn't really a big loss for the PC. The PC let it fall into disrepair and simply neglected it. Some people will even say that the bridge was purposely left neglected but that is open to debate.
The fact is, the New Haven was going to die anyway, so even if the PC never got their slimy paws on it, it still wouldn't have been around today. Don't get me wrong, I love the New Haven and in my opinion it was one of the most interesting and influential railroads in history, but the fact remains that it was too hurt in the end to carry on.
Ironically, however, there are a few shortlines that carry the names that to the shortlines that New York, New Haven, and Hartford originally gobbled up to form the "Little Giant of New England". The funny thing is, if you're ever in the state, the New Haven lingers like a ghost. Shortlines, tourist lines, mainlines, museums, artifacts, old stations, almost every bit of railroad-history in the state of Connecticut still keep the New Haven alive. You can feel it everywhere... if you were to walk along the Housatonic Railroad's tracks, you can even find the original rails of the New Haven's Berkshire Division, or, if you don't like to stray far from the mainline, next time you're on the NEC look at that triangular catenary...
-Jesse D.-:wave: