Is it possible to reduce the block interval in the future?
Yes and no. Any change to the protocol is possible if and only if &gt; 50% of the active nodes &quot;agree&quot; to it by adopting that protocol change.
Getting everyone to agree is very hard though. For example, Bitcoin Cash (BHC) exists as a fork of Bitcoin because of a dispute over increasing the block size. It seems likely such a push to lower the block time would lead to a similar messy debate and ultimately a split.