I don't think 2020 will be a bearish year, but it won't grow much either.
Well, if it will be bullish it's possible that there's a bigger growth in that year.
Bitcoin has reached $13K already this year and this year was ended not a bullish year, so what more could happen if 2020 is a bullish year.
Big possibility is that there will be a new ATH for bitcoin and the altcoins market will be alive again, that would be like 2017 scenario.