If someone casts Demiplane a second time, would you let them increase the size of their first demiplane?

@ChrisPerkinsDnD @JeremyECrawford If someone casts Demiplane a second time, would you let them increase the size of their first demiplane?

— shnelle hope (@shnellehope) March 18, 2017

If I felt so generous, I would put an upper limit on the size of the demiplane. #WOTCstaff https://t.co/7G5f0ofG7K

— Christopher Perkins (@ChrisPerkinsDnD) March 18, 2017