There's some amazing Telescope projects to look forward to coming in the 2020's! This is the "Giant Magellan Telescope" with a 368 meter squared collecting area! (2023)
This is the ELT, "Extremely Large Telescope" scheduled to open in 2024, it will have the biggest at 978 meter square Collecting Area!
Here's a visual comparison of the sizes! These telescopes will help us try to find Earth-like planets around other stars.
Even though it would be on the ground, on Earth, ELT's specifications states that it would "provide images 16 times sharper than those from Hubble." (Tadpole Galaxy, Hubble)
This is the back surface of one of the mirrors from the Giant Magellan Telescope. Credit: Ray Bertram/University of Arizona