Andrew Nowicki wrote:
All satellites and space telescopes should
be modular and compatible with telerobots
so that they can be upgraded frequently
and repaired.

If we require compatability with non-existent entities
then we might as well require that the device work by
magic, or be compatable with leprechaun-based maintenance
work or what-have-you. Besides which, maintenance
compatability does not come cheap, nor does the maintenance,
with or without robots. Realistically, you save very
little, if anything, from maintenance compatability.
Indeed, sometimes you lose because you spend money fixing
up obsolete hardware rather than putting the effort into
completely new systems. For the money we've spent on
HST upgrades already we could have had another HST-class
telescope on orbit *right now* (maybe more than one), and
it wouldn't be 15 years old with bits that use 20+ year old
technology.