To the OP, we have already seen that in 2013, when we entered multi-year bear market that only ended in 2015. Demand and with it price decreased. We will see it again eventually.
But rest assured that ANY commodity in the world goes through these up and down cycle. It wont change the fact, that as with any diminishing resource, Bitcoin will stedily keep rising in the following couple of years. Unless there is something FAR better, that can fully replace it.
The late 2013 to 2015 phase was just due to collapse of big bitcoin exchange.
Only due to negative trend people did not show their interest on those times. There would be no backing reason that will happen again as a cycle.
The demand for bitcoin is completely influenced adoption rate which is significantly on rising trend hence there would be no meaning on discussing about the possibilities of decreasing of demand for bitcoins.
Of course, since its use is still very low compared to other "applications" for calling it of this way, so it is more logical to assume that demand will continue to increase perhaps with a slightly faster growth pattern, peoples in the last decades especially, have a tendency to the increasing use of diverse devices in the businesses as in the home, to facilitate communication and business which allows them to combine several activities that would otherwise not be possible, so as time passes and more uses fit within this scope, demand will continue to present itself with this bullish trend especially speaking in periods of time not less than one year, let's compare it with for example cell phones, about 15 years ago few people had to use the first devices and now its use has spread enormously where now almost all people have one.
