It's impossible to know how high Bitcoin will rise, or if it will reach a ceiling and stagnate. Supply and demand is and always will be the golden rule. We don't know if something beyond Bitcoin will be created and perhaps take all the attention for itself. In the meantime, buy, hold, and monitor the market to avoid surprises... 
It's actually NOT that impossible if you think about it in terms of the money printing that world's Central Bank's like to do to create "booms" for their regions' economies, especially the country with the LARGEST economy - The United States of America.
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They'll never stop printing money, and in a zoomed out graph, money supply is always going up. Therefore Bitcoin's price is always going up as well.