The main problem at the moment is the limit of production.
That's not a problem.
The maximum bitcoin production is 3,600 bitcoins a day. Surprisingly that is built in to the system. They need to make some big changes to improve that limit.
If they don't then we hit max Bitcoin...
"The total number of bitcoins in circulation currently stands at 16.7 million, which will continue to rise until it reaches 21 million - the total supply set by the currency's rules."
Quote from link below. An interesting article from BBC, how much electricity does it need to make Bitcoin? Seemingly quite a bit.
http://www.bbc.co.uk/news/technology-42265728