population bottlenecks

[freepcrusher]

is it possible that such a thing ever happens again in congress? I found that for the republicans there was a time period in the late 20th century where it was not uncommon for the most senior republican to have served for less than 30 years:

Beginning of 94th congress January 1975
Most Senior Republican(s):
El Cederberg (MI-10)
Bob Wilson (CA-41)
John Rhodes (AZ-01)
years in office: 22

Beginning of 95th Congress January 1977
Most Senior Republican(s)
Same as above
Years in Office: 24

Beginning of 96th Congress January 1979
Most Senior Republican(s)
Bob Wilson (CA-41)
John Rhodes (AZ-01)
Years in Office: 26

Beginning of 97th Congress January 1981
Most Senior Republican(s)
John Rhodes (AZ-01)
Years in Office 28

Beginning of 98th Congress January 1983
Most Senior Republican(s)
Bill Broomfield (MI-18)
Bob Michel (IL-18)
Years in Office: 26

Beginning of 99th Congress January 1985
Most Senior Republican(s)
Same as above
Years in Office: 28

For the democrats meanwhile, the last time the most senior democrat had been in office for less than 30 years was in the mid 1930s when Adolf Sabbath, a German jewish immigrant representing Chicago, was the dean of the house.

Is it possible that the democrats could ever experience another bottleneck?