[en] In May 1983, shortly after the work in this area was begun, the principal investigator was invited to the Soviet Union as a guest of the USSR Academy of Sciences. During that visit a lecture on the future of high energy physics was delivered at three Institutes, two in Moscow and one in Novosibirsk. The overall future development of high energy physics was reviewed in the light of the then current extreme pessimism about achieving meaningful scientific results at energies an order of magnitude above those currently available. It was concluded by the author that there was little actual basis for pessimism but that considerable theoretical and experimental work needed to be done over the next 20 to 30 years to prevent a scientific crisis from occurring at that time. The need for more options and relatively straightforward nature of the extrapolation to large proton accelerators such as the SSC led the author to conclude that the alternative of a large (1 TeV) electron linear collider as a possible future option should be explored as well. The rest of this work, (which has been accepted for publication in Particle Accelerators) concentrated on the fundamental limitations which might prevent us from achieving such an accelerator, i.e., those limits which are of a general and fundamental character and are independent of additional limitations arising from a specific technology