What's with the Democratic opinion that, whoever the Republican is in 2016, he'll be a one termer?
They're all hacks.
Your list presents a straight four Republican terms. Hence, you are the last person to call anyone a hack.
Parties have won the White House for four straight terms in the past.
Last time was the FDR/Truman era and that was because of:
Great Depression
Republicans falling into shambles basically
FDR's charisma and popularity
Republicans nominating just plain bad candidates in 1936 and 1940
World War II
An upset in 1945
It was basically the perfect storm for the Democrats, like 1980 turned into the perfect storm for the Republicans, albeit 1980 was to a lesser degree.