There are at least four major proposals in the works, including another two IR telescopes, one with an even larger reflector, another with a wide-angle field of view; an x-ray observatory; and an optical + starshield pair (operating at 100k+ km separation) planet-finder. I've just posted in another top-level comment (https://news.ycombinator.com/item?id=29894335)

Further optical and gravitational observatories are amongst further options.

Trust that plans are in process.